
Class 

Book 

Copyright N?_ 



COPVR1GHT DEPOSIT 



General Data 



ON 



Thomson Watthour 
Meters 



General Electric Company 
Schenectady, N. Y. 



December, 1912 



No. Y-ii 



.Q52 



Copyrighted, 1912, 
by General Electric Company 



3-117 



0CLA33O178 



THOMSON WATTHOUR METERS 

The information and instructions given in this book are general in character 
and may be modified by special information which may accompany meters 
when shipped. 

FINISH OF THOMSON WATTHOUR METERS 

The finish of Thomson watthour meters is designated at the factory by 
numbers. 

Finish No. 1. Prominent parts finished in buffed brass. 

" No. 2. Prominent parts finished in buffed nickel. 

No. 3. Cover and base black japan. 

" No. 4. Prominent parts oxidized. 

No. 5. Prominent parts finished in dull black marine. 

Switchboard watthour meters both alternating current and direct current 
are, unless otherwise specified, finished in dull black marine. 

House type watthour meters are always finished in black japan. 

ORDERING THOMSON WATTHOUR METERS 
DIRECT CURRENT METERS 

In ordering direct current meters the following data is required: type 
and catalogue number, complete rating in amperes and volts (quoting normal 
operating voltage) , nature of circuit (whether two- or three-wire) . 

ALTERNATING CURRENT METERS 

In ordering alternating current meters, in addition to the above informa- 
tion, specify the frequency and nature of the circuit upon which meters are to 
be used, i.e. whether single-phase, two-phase three-wire, three-phase three-wire, 
two-phase four-wire or three-phase four-wire. 

If three-phase four-wire state both the normal delta and Y voltages of the 
circuit. 

If meters are to be used with transformers in the customer's possession the 
primary and secondary windings as well as the ratio should be specified. If 
the transformers are to operate other devices these should be specified so that 
it may be determined whether the meters will operate satisfactorily on such 
a combination. 



If a customer orders meters for use with transformers of other than General 
Electric manufacture the meters will be calibrated in accordance with their 
specified ratios assuming a straight line-calibration curve. 

In no instance should meters be operated from the secondaries of power 
transformers instead of potential transformers. Standard General Electric 
current transformers have a five ampere secondary winding and potential 
transformers a 110 volt secondary winding. The meters used with transformers 
are therefore wound for 5 amperes, 110 volts. 

PREPAYMENT WATTHOUR METERS 

In ordering prepayment watthour meters in addition to information 
applying in general to the class of meter desired, the rate of charge per kilowatt- 
hour for which the meters are to be adapted should also be specified. 

ORDERING OF PARTS 

Parts for obsolete as well as modern meters may be secured from the 
factory at any time. 

When ordering parts, the factory is greatly assisted if, in addition to the 
full rating, the serial number of the meter for which parts are desired is quoted. 

Correct material can always be sent if samples are forwarded with order, 
although, in most cases, samples are not required. 

Where catalogue numbers have been assigned to meter parts, they should 
be specified when ordering. 

CALIBRATING VOLTAGES AND NAME PLATE 
STAMPING 

Meters for both secondary and primary circuits will be calibrated and 
stamped in accordance with the following tabulation. 

Meters which are received at the factory for repairs or recalibration will 
be returned with their original name plate marking. 

Meters which are received at the factory for converting into another 
capacity must of necessity have their name plates changed. In such cases the 
tabulation as noted on page 5 will be followed. 

Prior to April 1, 1912, the range of voltage was from 100 to 120, 200 to 240 
instead of 106 to 120 and 212 to 240 and all data can be used upon the previous 
range. 



Volts 


Ampere 


Calibration 


Volts 


Ordered 


Capacity 


Voltage 


Stamped 


50/55 


All 


55 


50/55 


106/110 


3/600 inc. 


110 


106/110 


106/110 


Above 600 


110 


110 


111/115 


3/600 inc. 


115 


111/115 


111/115 


Above 600 


As ordered 


As ordered 


116/120 


3/600 inc. 


120 


116/120 


116/120 


Above 600 


As ordered 


As ordered 


121/130 


3/600 inc. 


130 


121/130 


121/130 


Above 600 


As ordered 


As ordered 


212/220 


3/600 inc. 


220 


212/220 


212/220 


Above 600 


220 


220 


221/230 


3/600 inc. 


230 


221/230 


221/230 


Above 600 


As ordered 


As ordered 


231/240 


3/600 inc. 


240 


231/240 


231/240 


Above 600 


As ordered 


As ordered 


400/440 


3/600 inc. 


440 


400/440 


400/440 


Above 600 


As ordered 


As ordered 


441/480 


3/600 inc. 


480 


441/480 


441/480 


Above 600 


As ordered 


As ordered 


500/550 


3/600 inc. 


525 


500/550 


500/550 


Above 600 


550 


550 


551/600 


3/600 inc. 


575 


551/600 


551/600 


Above 600 


As ordered 


As ordered 


1000/1100 


All 


110 


1000/1100 


1150 


All 


115 


1150 


2000/2200 


All 


110 


2000/2200 


2300 


All 


115 


2300 


3300 


All 


110 


3300 


5500 


All 


110 


5500 


6600 


All 


110 


6600 


11000 


All 


110 


11000 


13200 


All 


110 


13200 



Note: — This does not include portable test meters. These are calibrated 
and marked as ordered. 

JEWELS AND PIVOTS 

As in the past, the General Electric Company continues to use only the 
highest grade of selected Eastern sapphires, and diamonds. Each jewel is 
subjected to a rigid inspection, binocular microscopes being employed. Stones 
which do not conform to requirements are rejected. It is obvious that the 
percentage of rejections is large since it is difficult to secure even at exorbitant 
prices stones entirely free from flaws. 



The most skilled workmen are engaged to cut, polish and set the jewels, 
methods being employed which are known only to the General Electric Company 
and which were perfected only at considerable expense and after years of 
careful research. 

A method has been perfected for cupping diamond as well as sapphire 
jewels which eliminates the necessity of the ring-stone end-stone jewel. 

Cupped diamond jewels are furnished in all direct current meters of 50 kw. 
capacity and over, sapphire jewels being furnished in direct current meters 
under this capacity and in all induction meters. 

It is needless to state that the life of a diamond jewel is considerably longer 
than that of a sapphire. For this reason some of the larger operating companies 
have adopted the use of diamond jewels in all direct current meters. The 
expense of diamond jewels is inappreciable when compared to the increased 
revenue received from continued accuracy upon the lighter loads. 

Jewels which during service have worn slightly may be returned to the 
factory for recupping and repolishing. Badly worn jewels will not permit of 
this and are rejected. 

All jewels repolished by the General Electric Company are taken from their 
settings. Any attempt to repolish them without doing this is not permissible 
since it is impossible to insure the elimination of the polishing powder. 

Pivots for Thomson watthour meters are made of the highest grade of 
steel wire drawn and hardened expressly to conform to the General Electric 
Company's requirements. 

The fine pivot points are forced into a brass plug one end of which is threaded 
to engage into the end of the meter shaft. The end of the pivot is then stoned 
and highly polished. 

Notwithstanding the rigid requirements which are exacted upon the manu- 
facturers of the wire, an analysis of the wire is made from time to time to deter- 
mine the proportion of its constituents. 

Owing to the possibility of pivot points becoming charged with fine particles 
of sapphire which cannot be readily removed, pivots should never be repolished. 

REPLACING JEWELS AND PIVOTS 

When inserting a new jewel, it may be found necessary to raise or lower 
the moving element of the meter due to a slight variation in the tension of the 
jewel spring. This is readily effected by first tightening the jewel in its bushing 
sufficiently to permit of the jewel and bushing being moved as a unit. Next, 
loosen the hexagonal check nut. The desired adjustment can then be made by 
turning the jewel screw up or down, its bushing moving with it. This applies 
to all Thomson watthour meters excepting such Type 1-10 as have no lower 
jewel bushing. In this case it is only necessary to loosen the check nut and 
back out the jewel. In replacing it care must be taken to see that the disk is 
left in the same position in the air gap as when found. 

To insert a new pivot, remove the jewel screw, insert the pivot wrench 
and remove the old pivot. Place the new pivot in the end of the pivot wrench 



and screw into the shaft. During this operation, it is well to either wedge the 
disk firmly or hold it by pressing near the hub with the index and middle fingers. 
Too much care cannot be exercised in this operation since one can easily 
bend the disk and shaft and, in the case of direct current watthour meters, alter 
the tension of the brushes. 

REGISTERS 

The older five pointer type of register has been replaced in modern meters 
by the four pointer type excepting in the Type 1-10 meter where a three pointer 
register is employed upon meters of 5 and 10 amperes capacity. 

The four pointer registers' used upon Type I, IS, D-3 and upon similar 
types of alternating current meters differ from the registers used upon Type C, 
CS, G-3 and similar direct current meters in the position of the driving dog. 
In registers for the alternating current meters this dog is below the center line 
of the register, while in the direct current meters it is above the center. For 
this reason when ordering registers, it is not sufficient to quote merely the 
register ratio and dial face multiplier, but preferably the serial number, type, 
and rating of the meter should be given to insure correct filling of the order. 

The significance of the figures stamped upon the back plate of a meter 
register and the relation of these figures to the marking on the dial face as well 
as the figures on the edge of the disk are as follows: The figure marked on 
the disk is known as the meter constant, denoted by the letter "K", and 
represents the watthours recorded per revolution of the disk. For example 
consider a Type D-3 Thomson polyphase watthour meter rated 10/5 
amperes 2300/115 volts, 60 cycles, three-phase. A meter so rated has a 
meter constant "K" of 25; a register ratio of 40; a dial face multiplier of 10 
with "10" over the first circle and reads in kilowatt-hours. One revolution 
of the first pointer in this case equals 100 kilowatt-hours or 100,000 watthours. 
In all modern General Electric meters the worm wheel which meshes with 
the worm upon the meter shaft has 100 teeth. Hence the disk must make 100 
revolutions while the worm wheel is completing one. If 25 watthours are 
recorded by one revolution of the disk, for 100 revolutions or one revolution of 
the worm wheel 2500 watthours will have been recorded. The stamping 
upon the back plate of the register, which in this case is 40, signifies that the 
worm wheel must make 40 revolutions while the most rapidly moving pointer 
is completing one. Since 2500 watthours are recorded by one revolution of 
the worm wheel, 100,000 watthours will have been recorded when the worm 
wheel has completed 40 revolutions. 

From the above it will be seen that the following formula may be derived : 
Meter constant "K" X 100 X register ratio = number of watthours corres- 
ponding to one revolution of the most rapidly moving pointer. By substituting 
the proper values for two of the unknown factors in the above formula the 
third factor can readily be determined. 

This can be used to advantage in checking the value of the meter constant 

in case there is any question in regard to its accuracy. For example: Given 

I the number of watthours corresponding to one revolution of the first pointer 



as 100,000 and the register ratio as 40, to find the disk constant "K." Sub- 
stituting the values in the above formula and solving for "K" we have 

100,000 watthours 

- = "K" 

40X100 

hence "K" =25 watthours. 

READING METER REGISTERS 

Some companies do not require the meter reader to record the exact reading 
of the register in kilowatt-hours, but provide him with a book of printed forms 
representing the circles on the dial face and their subdivisions. The person 
reading the meter has only to indicate in pencil the position of the register 
pointers and submit in this form to the billing department where one person 
interprets the indications. 

This is a very satisfactory method of reading meters as there is little 
chance of error and a definite record of the meter's performance is always avail- 
able. A sample sheet taken from such a record book is shown on page 9. 

All modern Thomson watthour meters are equipped with direct reading 
registers. As the name implies, the number of kilowatt-hours recorded is 
read directly from the dial and under no circumstances should a multiplying 
constant be used in reading the meter unless the words "Multiply by 10,'" 
" Multiply by 100," etc., appear on the dial face. 

One revolution of the most rapidly moving pointer on both house and 
switchboard type meter registers equals 10 kilowatt-hours except registers with 
multiplying constants. In the case of some low capacity meters the usual 
switchboard meter register would have a dial constant of 1/10. To overcome 
the use of a fractional multiplier in such cases a dial is used having "1 " over the 
most rapidly moving pointer, "10" over the second, etc. In other words such 
dials read 1 kilowatt-hour for one revolution of the fastest moving pointer. To 
distinguish these dials, the right-hand circle is black, pointer and figures being 
white. This distinguishing feature will prevent errors due to any oversight in 
noting the different units in which the dials read. It is customary to furnish 
switchboard meters with registers which move ten times as fast as those of 
house type meters of the same ratings so that log readings can be made. 

Whenever SWITCHBOARD METERS are read so infrequently that the 
dials may repeat too often, the meters can be furnished with house type 
registers which move only 1/10 as rapidly. Conversely house type meters 
may be furnished with switchboard registers in cases where frequent readings 
are necessary. 

To prevent the necessity of replacing standard registers on switchboard type 
meters, orders should state that the house type register should be furnished if frequent 
readings are not to be made. 

The dial of the combined PREPAYMENT METER is enlarged and 
contains, in addition to the standard marking, a scale marked in plain figures 
over which a pointer passes indicating the number of coins remaining to the 
credit of the customer. When the meter has a separate prepayment attach- 
ment, the dial showing the number of coins standing to the customer's credit 
is placed on the attachment. 

8 



NAME 
LOCATION 
Meter No._ 
Rate 



Capacity_ 
Constant. 



DATE 



RECORD 




READING 



DIFF. 



EXAMPLES IN READING METER REGISTERS 

In deciding the reading of a pointer, the pointer before it (to the right) 
must be consulted. Unless the pointer to the right has reached or passed zero, 
or in other words, completed a revolution, the other has not completed the 
division upon which it may appear to rest. 

Figures 1 to 7 inclusive will assist in reading and enable one to detect 
a misplaced dial hand. 

Fig. 1 reads 11 kw-hrs. as the pointer to the extreme right has made one 
complete revolution thus advancing the second pointer to the 1st digit and has 
itself passed the 1st digit on its dial. 

Fig. 3 reads 424 kw-hrs. The second pointer (from the right). has made 
four complete revolutions and has advanced the pointer of the third circle to the 
fourth digit. 

The first pointer has, disregarding the indications of the third circle, made 
two complete revolutions advancing the second pointer to the second digit 
and has itself passed the fourth digit on its dial. 

Fig. 5 reads 4588 kw-hrs. 

The third pointer (from the right) has made four complete revolutions and 
has advanced the pointer of the fourth circle to the fourth digit. The second 
pointer has, disregarding the indications on the fourth circle, made five revolu- 
tions and has advanced the pointer of the third circle to the fourth digit. The 
first pointer has, disregarding the indications of the third and fourth circles, 
made eight complete revolutions and has advanced the pointer of the second 
circle to the eighth digit and has itself passed the eighth digit on its dial. 

In Fig. 2 the pointer of the second circle is misplaced. The actual reading 
of the dial is 9 kw-hr., though one might erroneously read it 19 kw-hrs. The 
second pointer should not indicate one on its circle until the first pointer has 
reached or passed zero. 

In Fig. 4 the pointer of the third circle is misplaced. The actual reading 
of the dial is 9484 kw-hrs., although it might very easily be read 9584 kw-hrs. 

It will be seen that the second pointer has not yet reached or passed zero, 
reading only 8, consequently the third pointer should not rest at 5. 

In Fig. 6, the pointer of the fourth circle is misplaced. The actual reading 
of the dial is 2855 kw-hrs., although it might very easily be read 3855 kw-hrs. 

The third pointer, as will be noted, has not yet reached or passed zero, as 
it reads only 8, consequently the fourth pointer has not reached 3. 

In Fig. 7 the pointer of the second and fourth circles are misplaced. The 
actual reading of the dial is 4818 kw-hrs., although it might very easily be read 
5828 kw-hrs. 

Since the first pointer to the right has not yet made a complete revolution, 
the pointer of the second circle should not indicate 2, and since the pointer of 
the third circle has not yet completed a revolution, the pointer of the fourth circle 
should not indicate 5. 

In a very short time, a person may by setting a meter register at different 
readings become familiar with the various positions of the pointers enabling 
them to read accurately and rapidly and determine at a glance a misplaced 
pointer. 

10 



EXAMPLES IN READING METER REGISTERS 



lYasV 



5 & 



HOURS 



Fig. 1 



Fig. 2 



. 



KILOWATT HOURS 



- 
HOURS 



Fig. 3 



Fig."4 



fO.000 1.000 



OO (0 



•3 f tK # 3.13 






'8 o K 



' 5 ^x \£> 5 4, 
KILOWATT HOURS 







KILOWATT HOWS 



Fig. 5 



Fig. 6 



^%4%ni 



KILOWATT HOURS 






Fig. 7 

No. 1 = 11 kw-hrs. No. 2 = 9 kw-hrs. 

No. 3 = 424 kw-hrs. No. 4 =9484 kw-hrs. 

No. 5 =4588 kw-hrs. No. 6 =2855 kw-hrs. 

No. 7=4818 kw-hrs. 

11 



INS'TAtLIIfG THOMSON WATTHOUR METERS 

Instruction books showing the manner of connecting Thomson watthour 
meters in circuit and containing specific directions in regard to installing same 
are included in each shipment. This information should be carefully noted 
before attempting the installation. 

All Thomson watthour meters have a jewel bearing and should be handled 
with care. If the meter has a shipping device, this should, be used when trans- 
porting same to and from the point of installation, and the moving element 
should not be lowered on the jewel until all of the preliminary work of installa- 
tion has been completed. 

If the meter is of the house type, considerable judgment must be exercised 
in deciding upon a proper location for it. A dry, light place as free from vibra- 
tion as possible should be selected. The location of the meter should also be 
as accessible as possible, since this will decrease the amount of labor necessary 
in reading and testing it. 

It is always well to be sure that the meter operates freely on a light load 
before leaving it. Caution. Before leaving the meter, see that the top bearing is set 
midway between the shoulder of the worm and the top of the shaft, as shown in sketch 
on page 17, Fig. 9. In the installation of direct current watthour meters the 
adjustment of the brushes should be noted. Never leave a meter which sparks at 
the commutator. This may happen if the brush tension is too tight and will 
materially increase if the meter is subject to vibration. If the brush tension is 
too heavy, friction errors are introduced, causing the meter to register slow on 
the lighter loads. 

A method of estimating the brush tension is to draw first one and then 
the other arm approximately 3^8 in. from the commutator, noting when released 
that they do not rebound. 

REQUIREMENTS FOR CHECKING AND TESTING 
WATTHOUR METERS 

The importance of providing facilities for periodically checking the accuracy 
of watthour meters and making such minor repairs as may be necessary, is 
fast becoming recognized by all central station managers. 

It is considered the best practice to test house type meters on the cus- 
tomer's premises, and for this purpose rotating standards and portable meter 
testing rheostats are recommended. This method of testing saves the expense 
of transporting the meters to and from the central station, enables correct 
tests to be taken notwithstanding fluctuating load conditions, and permits of 
adjusting the meter under the exact local conditions as regards vibration, etc., 
on which it is to operate. 

Every central station should have a room set apart for a testing department. 
This may not be at all elaborate, and its equipment would vary, depending on 
the size of the company, the character of the installation, etc. The testing 
department should be located in a dry, well lighted place as free from vibra- 

12 



tion as possible. In this department such minor repairs as are necessary can 
be made, as well as all tests which it is not possible or deemed advisable to 
make on the customer's premises; also tests on large capacity switchboard 
meters, etc. 

Some companies suspend the racks upon which the meters are hung for 
test, by wires fastened to the ceiling, using weights suspended below the racks 
for balancing. Such a rack will be practically free from vibration. For load 
it is customary to use a bank of lamps so connected to the switchboard as to 
permit any desired load to be easily applied. These lamps can be connected 
in steps so that light and full load can be easily obtained. For heavier loads 
resistance wire or a water rheostat is often used. 

For lagging induction watthour meters a theater dimmer will be found 
very convenient, or if such is not available, the reactive coils of an arc lamp 
may be used to advantage. For very fine regulation ordinary rheostats are 
employed. 

For the testing department, an equipment of high grade instruments is of 
course necessary. These may be used to advantage not only in checking service 
meters but also the rotating standards. 

For testing direct current watthour meters a portable ammeter and volt- 
meter are required, and for alternating current watthour meters, a portable 
wattmeter should be added. Two sets of instruments of different capacities 
should be provided, one of sufficient capacity to take care of the full load of the 
meter, the other of small enough capacity to take care of the light load with a 
proper degree of accuracy. If necessary, transformers may be used in con- 
nection with the alternating current instruments and shunts in connection 
with the direct current. 

It is advisable to have at least two reliable stop watches for timing the 
meter, one to serve as a check on the other in test. Too much care cannot be 
exercised in the selection, handling and care of these watches and their 
accuracy should be periodically checked. 

By applying to the nearest District Office, recommendations may be obtained 
to cover any specific case. 



METHOD OF TESTING WITH INDICATING 
INSTRUMENTS 

For convenience in testing General Electric meters, a mark will be noted 
near the outer edge of the disk in order that the revolutions may be accurately 
counted^. 

The watts recorded by the meter, i.e., the rate at which the meter is record- 
ing can be found for General Electric meters by the following formula. 

XT T KX3600XR 

.No. I. =watts. 

5 

"K" is the meter calibrating constant, and will be found marked on the 

disk. 



13 



3600 is the number of seconds in an hour. Multiplying the watthours 
per revolution of the disk (K) by the number of seconds in one hour reduces the 
watthours to watt-seconds per revolution of the disk. 

R is the number of revolutions of the disk counted for the test. Multi- 
plying the watt-seconds per revolution of the disk by the total number of 
revolutions counted gives the total watt-seconds for the test. 

S is the number of seconds required for the disk to make (R) revolutions. 
Dividing the total watt-seconds by the number of seconds (S) gives the total 
watt load recorded by the meter. 

Dividing the total watthours recorded by the meter by the actual watts 
read on the indicating instruments and multiplying by 100 gives the percentage 
accuracy of the meter under test. 

A number of revolutions should be taken, so that the time of observation 
will be at least from 40 to 60 seconds. If materially less than 40 seconds, errors 
in the measurement of time are probable, and observations of longer periods 
than 60 seconds are generally unnecessary. 

METHOD OF TESTING WITH PORTABLE ROTATING 
STANDARDS 

The following formula is used when calibrating Thomson watthour meters 
with General Electric portable test meters. 

.TO rXk 

No. 2. =accuracy. 

RXK 

when r = revolutions of disk of meter under test. 

k = constant to be used for meter under test. 

R = revolutions of test meter read from the dial. 

K = constant for the particular coil used of test meter. 

The dial of the test meter reads directly in revolutions of the meter disk. 
Note the dial reading at the start and at the end of the test. 

The difference between the two dial readings gives the number of revolu- 
tions of the disk. Multiply this by the proper meter constant "K" (the watt- 
hours per revolution of the disk) and the result is the total watthours recorded 
by the test meter. 

For the service meter under test count the revolutions of the disk. For 
five per cent, of full load, one or two revolutions. For full load, 20 or 30 revo- 
lutions is sufficient. Multiply the disk revolutions by the meter constant (k) 
marked on the disk and the result is the total watthours recorded by the 
service meter under test. To find the percentage accuracy, divide the watt- 
hours recorded by the service meter under test by the watthours recorded by 
the portable test meter and multiply by 100. 

Caution 

Extreme care should be exercised by the tester to guard against either the 
instruments or meters indicating or recording the losses of one another since 
this might cause an error of appreciable magnitude upon the lighter loads. 

14 



In order to avoid this, the current circuits of the testing instruments 
should be connected in series with the meter under test, while the potential 
circuits of both the testing instruments and meter under test should be con- 
nected to the source side of the line at some point ahead of both meter and 
instruments. 

In general, three-wire meters can be tested as two-wire meters by con- 
necting the current coils in series. The meter constant (K) must be divided 
by two when making the test in this manner. When testing between sides 
with only one current coil in circuit the constant (K) marked on the meter 
should be used. 

In testing polyphase meters it is easier to check as a single-phase meter. 
Connect the potential circuits in parallel, the current coils in series and divide 
the meter constant (K) by two (except in the case of four-wire three-phase 
meters having three current coils, when the constant "K" should be divided 
by 4). 

TESTING METERS USED WITH CURRENT AND 
POTENTIAL TRANSFORMERS 

Meters used with current and potential transformers are generally cali- 
brated as secondary meters, in which case the constant (K) marked on the 
disk should be divided by the product of the ratios of the current and potential 
transformer before applying it in formulas Nos. 1 and 2, given above. 



15 



GENERAL INSTRUCTIONS PERTAINING TO THE 

INSPECTION OF THOMSON WATTHOUR 

METERS PREVIOUS TO TEST 

Before attempting to test a meter it should be inspected for mechanical 
defects. The thoroughness of this inspection will depend upon the nature of 
the test. For instance, a periodic test taken at the point of installation would 
not in general necessitate as thorough an inspection as a shop test which is 
taken on meters removed from service or a complaint test. If, however, after 
making a periodic test the meter is found to be very inaccurate, it is necessary 
to make a rigid inspection to determine the cause. 

In other words, judgment should be exercised in determining the amount 
of inspection necessary to satisfy a given condition. It is well to err in over- 
inspection, rather than on the other side. 

The following hints may be useful to the meter inspector or tester: 

Among the numerous observations which are essential in testing meters, 
the bearings, moving element, registering mechanism, damping mechanism 
and electrical element should be given special attention. 

BEARINGS 

The bearings 
should be free from 
dust and other 
particles which 
would tend to 
grind or rub against 
each other, thus 
roughening the 
surfaces and con- 
sequently increas- 
ing friction result- 
ing in a retardation 
of the moving 
element. Rough 
or damaged jewels 
should be replaced 
by new ones, in 
which case the 
pivot should also 
be replaced since it 
may have become 
damaged by com- 
ing in contact with 
the defective jewel. 
Lower jewel bear- 
ings are apt to have 
become dry during 
service. For such 
Fig. 8 cases, it is recom- 

16 



Spr/rrg 1 for- ■Sft/fao/hff Ca/3 







Fig. 9 



mended that a minute drop of high grade watch oil be applied to its 
surface. 

If during service, the top of the meter shaft has become dirty or 
corroded, it may be cleaned by the use of cotton or linen tape. If this 
fails, a piece of tape saturated with benzine or gasolene may be used. 
The top bearing should be set in a posi- 
tion so that the lower end is midway between 
the shoulder of the worm and the top of the 
shaft as shown in sketch. 

MOVING ELEMENT 

The disk should be examined to see that it 

runs true. It should be free to rotate midway 

between the jaws of the magnets. Any 

foreign matter which might possibly have col- 

lotrerenc lected since the installation of the meter 

or Cop must be removed. 

oectr/fyastuo 

Should the worm be dirty, it may be cleaned Fig. 10 

by running a fine piece of thread through it. 
If very dirty, the application of benzine or gasolene 
will assist in cleaning, after which, parts should be 
carefully wiped. 

In the case of direct current meters, should the com- 
mutator or brushes be corroded, they may be cleaned 
by the use of cotton or linen tape. 

Under no circumstances should a chemical polishing compound or emery 
cloth be used upon the commutator, brushes or top of the meter shaft. The 
former would be apt to gum and perhaps clog the fine threading of the worm. 
The latter would cause the top of shaft to become charged with fine particles 
of emery which would gradually work its way into the bearing resulting in 
trouble. 

REGISTERING MECHANISM 

The position of the pointers upon a meter register should be noted, par- 
ticularly if the meter has been subjected to severe jars or excessive vibration 
as it is possible that they may have become displaced. This point is of great 
importance, since incorrect bills might be rendered. 

It should be noted that the worm wheel meshes properly with the worm 
upon the meter shaft and in turn, that the driving dog upon the worm wheel 
shaft engages properly with the transmitting dog upon the meter register. 

If it is deemed necessary to oil the registering mechanism, it should be 
carefully wiped afterward, to prevent the superfluous oil from dropping. Only 
a high grade of oil should be used. Under no circumstances should the worm 
or worm wheel be oiled since oil upon these parts would collect dust and 
other particles which would interfere materially with the operation of the meter. 

DAMPING MECHANISM 

The magnets, two in number, are rigidly mounted in a "shoe," the north 
seeking pole of one opposite, the south seeking pole of the other. When two 

17 



pairs are used they are astatically arranged, each pair of which may be moved 
laterally to effect necessary adjustment. Should the magnets be removed, 
care should be used when replacing that the astatic arrangement be maintained. 
When inspecting the meter the magnets should be carefully inspected for 
proper alignment, and to see that no foreign substance is lodged upon them. 

ELECTRICAL ELEMENT 

The windings should be inspected for grounds and short circuits. Care . 
should be taken that all connections are properly tightened and that all soldered 
connections are properly made. 

TYPE I WATTHOUR METERS 

The Type I watthour meters are for use upon single-phase two- or three- 
wire circuits. They are built self-contained in capacities of 3, 5, 10, 15, 25, 50, 
75, 100, 150, 200 and 300 amperes, 106 to 120 and 212 to 240 volts, two-wire, 25 
to 140 cycles, and 3, 5, 10, 15, 25, 50, 75, 100 and 150 amperes, 212 to 240 
volts, three- wire, 25 to 140 cycles. For three-wire circuits of above 150 
amperes, current transformers are employed. 

If in the installation of switchboard apparatus, economy is an important 
factor, this type of meter may be used with good results upon a switchboard 
it being customary to install upon the back of the board. 

When furnished for the higher frequencies it is furnished double-lagged for 
this higher frequency and 60 cycles as the higher frequency systems are 
now quite generally being converted to 60 cycles. It is calibrated for both 
frequencies and is always sent out connected for that frequency for which it 
is ordered. Directions for changing the connections for a change in frequency 
will be found on pages 73 and 74. 

This meter is finished in dull black japan, the cover being provided with 
glass windows for observing the operation of the moving element and for reading 
the meter register. 

When so desired a moulded glass cover can be furnished. 

The leading in wires enter into binding posts located at the sides of the 
meter 

When ordering Type I watthour meters for use with transformers the 
order must so specify since meters will then be furnished whose potential 
circuits are independent of the current. % 

Approximate Shipping Weight, all Voltages: 

(1 in a box, 15 lb. 
2 in a box, 20 lb. 
[4 in a box, 54 lb. 
f 1 in a box, 24 lb. 

50 and 75 amperes j 2 in a box, 45 lb. 

[ 4 in a box, 86 lb. 
1/w ' ,,-.. . f 1 in a box, 35 lb. 

100 and 150 amperes [ 2 in a box, 65 lb. 

onn f 1 in a box, 45 lb. 

300 amperes [ 2 ina box, 70 lb. 

18 



TYPE 1-8 WATTHOUR METERS 

The Type 1-8 watthour meter like the Type I is for house service and is 
built in capacities of 3, 5, 10, 25, 50 and 75 amperes, 106 to 120 and 212 to 240 
volts, 25 to 140 cycles, for use upon two- or three-wire single-phase circuits. 

The meter is essentially the same as the Type I except that the terminals 
are located in a separate compartment at the bottom of the meter, permitting 
the connection being made without removing the cover of the meter proper. 

For gaining access to the jewel screw when the meter is sealed, the meter 
cover is drilled directly below the jewel screw and by removing the terminal 
cover the jewel may be readily removed for inspection or replacement. 

Replacing the terminal cover prevents further access to the jewel screw. 

Approximate Shipping Weight, all Voltages: 

lin 1 box, 22 lb. 

5 to 25 amperes inclusive ■{ 2 in a box, 49 lb. 

4 in a box, 94 lb. 

{1 in a box, 25 lb. 
2 in a box, 51 lb. 
4 in a box, 98 lb. 

TYPE 1-10 WATTHOUR METERS 

The Type 1-10 watthour meter is furnished to meet the demand for a 
low capacity single-phase, two- or three-wire house meter of moderate price to 
enable lighting companies to more profitably extend their service to the 
smaller consumers. 

This type of meter is different in construction and appearance from any 
type of induction meter previously put on the market by the General Electric 
Company. It is circular in shape and has a moulded terminal block at the 
bottom of the meter base into which the leading in wires pass. The jewel and 
pivot are removable and the friction compensation is adjustable to allow for 
wear, etc. The register reads in kilowatt-hours, the dial being of dull finish 
porcelain, and easily legible. The meter back and cover are finished in dull 
black japan. 

Approximate Shipping Weight: 

One in a box, 13 lb. 

Two in a box, 22 lb. 

Three in a box, 45 lb. 

TYPE IS WATTHOUR METERS 

The Type IS watthour meter was designed for switchboard service for use 
upon two- and three-wire circuits. It was built self-contained in capacities of 
3, 5, 10, 15, 25, 50 and 75 amperes, 100 to 120, 200 to 240, 400 to 480 and 
500 to 600 volts, 25 to 140 cycles. 

19 



This type of meter has a rectangular glass cover and was finished in dull 
black throughout. 

TYPES IS-2 AND IS-3 WATTHOUR METERS 

Superseding the Type IS are the Types IS-2 and IS-3, the difference being 
that permanent magnets of the same type as in the Type I meter are used, 
the adoption of which slightly changes the appearance of the meter. The IS-2 
meter has a cast metal cover, the front surface of which is pebbled. It is pro- 
vided with windows for reading the dial and for observing the rotation of 
the disk. 

The IS-3 differs from the IS-2 only in being furnished with glass cover. 

They are built self-contained in capacities of 5, 10, 15, 25, 50, 75, 100 and 
150 amperes, 106 to 120, 212 to 240, 400 to 480 and 500 to 600 volts, 25 to 
140 cycles, 2 wire. 

Approximate Shipping Weight 

T „ f One in a box, 60 lb. 
\ Two in a box, 110 lb. 

T ~ ' f One in a box, 65 lb. 
\ Two in a box, 120 lb. 

TYPE D-3 WATTHOUR METERS 

The Type D-3 watthour meter is for house service for use upon 
two-phase, three-phase or monocyclic circuits of balanced or unbalanced loads. 
It is built self-contained in capacities of 3, 5, 10, 15, 25, 50, 75, 100 and 150 
amperes, 106 to 120, 212 to 240, 400 to 480, 500 to 600 volts, 25 to 140 cycles, 
for use upon four- wire two-phase, three-wire two- and three-phase and mono- 
cyclic circuits, in capacities of 3, 5, 10, 15, 25, 50 and 75 amperes, 212 to 
220 A 115 to 125 Y; 400 to 440 A230 to 250 Y volts, 25 to 140 cycles, for use 
upon four-wire three-phase circuits. 

Originally, four-wire three-phase polyphase watthour meters were con- 
structed with only two current elements, necessitating their being wound for 
one and one-half times the current delivered from the secondary of the trans- 
former from which they were to operate. For diagrams illustrating the above 
refer to pages 151 and 153. All four- wire three-phase polyphase watthour 
meters whether for use with or without transformers are now constructed with 
three current elements. 

This type of meter may be used for switchboard service with good results, 
where a back connected meter is not desired. 

This meter is finished in dull black japan, the cover being provided with 
glass windows for observing the operation of the moving element and for reading 
the meter register. 

20 



The leading in wires enter into binding posts located at the sides of the 
meter. When ordering Type D-3 watthour meters for use with transformers 
the order must so specify since meters will then be furnished whose potential 
circuits are independent of the current. 

Approximate Shipping Weight: 

' __ • 1 . J 1 in a box, 46 lb. 

3 to 7o amperes inclusive ^ _ . . orx „ 

[2ma box, 90 lb. 



100 and 150 amperes. 



1 in a box, 60 lb. 

2 in a box, 97 lb. 



TYPE D-4 WATTHOUR METERS 

This type of meter is in general similar to the Type D-3 except that the 
terminals are located in a separate compartment at the sides of the meter 
back permitting the connections being made without removing the cover of the 
meter proper. 

It is built in capacities of 3, 5, 10, 15, 25, 50 and 75 amperes, 106 to 120, 
212 to 240, 400 to 480, 500 to 600 volts, 25 to 140 cycles, for use upon four-wire 
two-phase, three-wire two- and three-phase and monocylic circuits, and 212 to 
220 A115 to 125 Y, 400 to 440A230 to 250 Y volts, four- wire three-phase. 

When ordering meters for use with transformers, the order should so specify. 

Shipping weights approximately the same as the Type D-3 meter. 



TYPES DS-2 AND DS-3 WATTHOUR METERS 

The Types DS-2 and DS-3 watthour meters are for switchboard service 
for use upon two-phase, three-phase or monocyclic circuits of balanced or 
unbalanced loads. They were built self-contained in capacities of 3, 5, 10, 15, 
25, 50, 75, 100 and 150 amperes, 100 to 120, 200 to 240, 400 to 480, 500 to 600 
volts, 25 to 140 cycles, for use upon four-wire two-phase, three-wire two- and 
three-phase and monocyclic circuits and in capacities of 3, 5, 10, 15, 25, 50 and 
75 amperes, 200 to 220 A115 to 125 Y, 400 to 440 A200 to 250 Y volts, 25 cycles 
and above for use upon four-wire three-phase circuits. 

The former type of meter has a cast metal cover, the front surface of which 
is pebbled and is provided with glass windows for observing the operation of 
the moving element and for reading the meter register. 

The latter type of meter has a rectangular glass cover. 

The current and potential circuits of these meters are independent of each 
other, hence meters are interchangeable for use with or without transformers. 

The Types DS-2 and DS-3 meters are finished in dull black, the raised 
portion of the Type DS-2 meter cover being finished in polished copper. 

21 



TYPES DS-4 AND DS-5 WATTHOUR METERS 

The Types DS-4 and DS-5 meters supersede respectively the Types 
DS-2 and DS-3. 

The same general characteristics are maintained in the Types DS-4 and 
DS-5 watthour meters as in the Types DS-2 and DS-3, the slight difference 
being in the location of the electrical elements. 

DS-4 One in a box, 85 lb. 

DS-4 Two in a box, 135 lb. 

DS-5 One in a box, 120 lb. 

INDUCTION PORTABLE TEST METERS 

The Type IB portable test meter represents the first induction portable 
test meter manufactured by the General Electric Company. This type of meter 
had the electrical element of the Type IS meter. 

In the Type IB-2 meter, the use of the damping system of the Type IS 
meter was discontinued, and the damping system of the Type I meter adopted. 
A new design of fuse plug was incorporated which permitted of the renewing 
of the fuse wire without replacing the entire plug. Modifications in general 
were made to better adapt the meter to the requirements of operating com- 
panies. 

The Types IB and IB-2 meters were built with capacities of 1, 10 and 20 
amperes. 

Upon the designing of the Type IB-3 meter the range was increased, this 
type of meter being built in capacities of 1, 10 and 20 amperes and 1, 5, 10, 50 and 
100 amperes. 

In low capacity meters, i.e., 1, 10 and 20 amperes, the one ampere circuit is 
protected by a fuse and in the high capacity meters, i.e., 1, 5, 10, 50 and 100 
amperes, the 1 and 10 ampere circuits are protected by fuses. 

The Type IB-4 meter differs in minor mechanical details from the Type 
IB-3, having the same electrical characteristics and capacities. 
One in box only, 40 lb. 

TYPE C WATTHOUR METERS 

The Type C watthour meter is for house service for use upon direct cur- 
rent two- and three- wire circuits. 

It was built in capacities of 5, 10, 15, 25, 50, 75, 100, 150, 300 and 600 
amperes, 100 to 120, 200 to 240, 500 to 600 volts two-wire and 5, 10, 15, 25, 50, 
75, 100, 150 and 300 amperes, 200 to 240, 400 to 500 volts three-wire. 

For meters up -to 250 volts, the resistance was wound upon a tube and 
mounted inside of the meter on the back. For meters above 250 volts up to 
and including 600 volts the resistance was wound on tubes and mounted in 
an external cage upon the meter back. 

22 



This type of meter was finished in dull black japan, the cover being provided 
with a glass window for reading the meter register. When so specified, moulded 
glass covers were furnished. 

The leading in wires entered into binding posts located at the sides of the 
meter. 

TYPES C-6 AND C-7 WATTHOUR METERS 

The Type C-6 watthour meter supersedes the Type C in capacities up to 
250 volts; above this capacity, Type C-7 being furnished. 

The Types C-6 and C-7 watthour meters are built in the same current 
capacities as the Type C, the Type C-7 being built for use on two-wire circuits 
only, of voltages ranging from 251 to 600 volts. 

The combined shunt and resistance is used upon all Type C-6 meters. 
Upon Type C-7 meters, the separate shunt field coil is used, and for meters 
up to 600 volts the resistance is wound upon tubes mounted in an external 
cage upon the meter back. 

These meters are finished in dull black japan, the covers being provided 
with glass windows for reading the meter register. When so desired, moulded 
glass covers can be furnished. 

The leading in wires enter into binding posts located at the sides of the 
meter. 

Approximate Shipping Weight, all Voltages: 



, a. in a box, 26 lb. 

5 to 50 amperes inclusive < _ . , __ „ 

' ° in a box, 5o lb. 



flin 



__ / 1 in a box, 35 lb. 

75 amperes \ 2 in a box, 69 lb. 

100 to 600 amperes 1 in a box, 48 lb. 

TYPES C-5 AND C-9 WATTHOUR METERS 

The Type C-5 meter is essentially the Type C-6, but back connected. 
It was built in similar capacities as the Types C-6 and C-7. 

Meters up to 250 volts were equipped with combined shunts and resist- 
ances, above this voltage the resistance being wound on tubes and mounted 
in a separate box. 

This type of meter was finished in dull black japan, the cover being provided 
with a glass window for reading the meter register. Moulded glass covers 
were furnished whenever desired. 

This type of meter has been superseded by the Type C-9. 

The difference between Types C-5 and C-9 watthour meters lies in the 
omission of supporting lugs on the Type C-9 meter and the vertical arrangement 
of the potential studs. 

23 



Approximate Shipping Weight, all Voltages: 

in a box, 26 lb. 



( 1; 

\2: 



5 to 50 amperes inclusive. ... 

\2 in a box, 55 lb. 

,__ < f 1 in a box, 35 lb. 
75 amperes < 

[2 in a box, 69 lb. 

100 to 600 amperes 1 in a box, 48 lb. 

TYPES CQ AND CQ-2 THOMSON WATTHOUR 
METERS 

The Type CQ watthour meter is for house service for use upon direct 
current two- and three-wire circuits. It is particularly adapted for installations 
where a meter which is independent of stray fields is required. 

The construction and arrangement of the field coils, of which there are 
four, is radically different from any of the other types of direct current watt- 
hour meters herein described. The field coils are formed in quadrants so as to 
surround the four-pole armature as completely as possible, this construction 
minimizing the effect of stray fields. 

The Type CQ meter is built in capacities of 50, 75, 100, 200 and 400 amperes, 
106 to 120, 212 to 240, 500 to 600 volts, two-wire, and 50, 75, 100 and 200 
amperes, 212 to 240 volts, three-wire. For meters up to 240 volts the resistance 
is wound upon tubes and mounted in an external cage upon the meter back. 
Above this voltage up to 600 volts, the resistance is wound on tubes and 
mounted in a separate box. 

This type of meter is finished in dull black japan, the cover being provided 
with a glass window for reading the meter register. Moulded glass covers can 
be furnished when so desired. 

The leading in wires enter into binding posts located at the sides of the 
meter. 

Shipping weights are approximately the same as C-6. 

The Type CQ-2 watthour meter differs only from the Type CQ in that 
it is back connected. 

TYPE CS THOMSON WATTHOUR METERS 

The Type CS astatic watthour meter is for switchboard service for use on 
direct current two- and three-wire circuits. It is built in capacities of 50, 75, 
100, 150, 200, 300, 400, 600, 800, 1200 and 1500 amperes, 106 to 120, 212 to 240, 
500 to 600 volts, two-wire, and 212 to 240 volts, three-wire. 

The damping magnets are enclosed in a laminated shield of soft steel 
punchings thereby protecting them from the effects of the short circuits. Both 
the armatures and damping magnets are astatically arranged, thus minimizing 
the effects of stray fields. 

24 



The resistance for all Type CS wattho-ur meters is wound upon tubes 
and mounted in a separate box. The CS meter has a rectangular glass cover 
and is finished in dull black, the prominent internal parts being finished in 
polished brass. 

TYPES G-2 AND G-3 ASTATIC WATTHOUR METERS 

The Type G-2 watthour meter is for switchboard service for use upon 
direct current two- and three-wire circuits. It was built self-contained in 
capacities of 2000, 3000, 4000, 6000, 8000 and 10,000 amperes, 100 to 120, 200 to 
240, 500 to 600 volts, two-wire, and 2000, 3000, 4000 and 6000 amperes, 212 to 
240 volts, three-wire. The resistance for all Type G-2 watthour meters is wound 
upon tubes and mounted in a separate box. 

This type of meter has a rectangular glass cover and is finished in dull black 
the prominent internal parts being finished in polished copper and brass. The 
cover is secured to the switchboard by means of four bolts. 

The Type G-3 watthour meter superseding the Type G-2 is in every respect 
similar to the Type G-2, except that the cover or case consists of two parts, a 
metal sub-base which is bolted to the switchboard and a glass cover which is 
fastened to this sub-base by means of screws. This construction makes the 
cover removable from the front. 

The armatures and the damping magnets of Types CS, G-2 and G-3 
watthour meters are astatically arranged, this arrangement minimizing the 
effects of stray fields. 

The damping magnets of the above types of meters are enclosed in a 
laminated shield of soft steel punchings, thereby protecting them from the effects 
of short circuits. 

DIRECT CURRENT PORTABLE TEST METERS 

The Type CB portable test meter was a direct current portable standard 
built along the lines of the alternating current test meters. The electrical 
characteristics of the Type CB meter are similar to the Type C. This type 
of meter was built in capacities of 1, 2, 10, 20 and 40 amperes. 

In the designing of the Type CB-2 meter which differed somewhat in 
mechanical details from the Type CB, the range was increased by furnishing 
a higher capacity meter with 5, 10, 50 and 100 ampere coils, as well as the 
1-40 ampere meter above mentioned. 

The CB-3 meter differed only in minor mechanical details from its prede- 
cessor, the CB-2, and has now been superseded by the CB-4 which has further 
improved electrical characteristics. 

PREPAYMENT WATTHOUR METERS 

The Type IP prepayment watthour meter is essentially the Type I 
differing only in the addition of extra terminals and in the contact making 
register. It is built in capacities of 3, 5, 10, 15 and 25 amperes, 106 to 120, 

25 



212 to 240 volts, 25 to 140 cycles, two-wire, and 212 to 240 volts, 25 to 140 
cycles, three-wire. This type of meter may be used with either the Form 3 or 
Form 4 prepayment attachment. 

The ordinary Type I meter cannot be used with these prepayment attach- 
ments, since it lacks the terminals and the contact making register above 
referred to. 

The Type IP-2 prepayment watthour meter is a combination of a separate 
prepayment attachment and meter, the prepayment mechanism, which is of 
the well known "Wood" construction, being mounted on the top of the meter 
proper, the gearing and actuating mechanism being directly connected to the 
recording mechanism of the meter. This type of meter was built in capacities 
of 3, 5, 10, 15 and 25 amperes, 100 to 120, 200 to 240 volts, 25 to 140 cycles, 
two-wire, and 200 to 240 volts, 25 to 140 cycles, three-wire, and could be 
adapted for either a ten or twenty-five cent coin. This meter was finished in 
black japan, the cover as in the other forms of induction meters being provided 
with a register window and disk window. 

The Type IP-3 prepayment watthour meter is a radical redesign of and 
superseded the Type IP-2 meter. The meter and prepayment mechanism are 
housed in the same case and are accessible for inspection and adjustment, by 
removing the meter cover. The coin box may be emptied by the collector 
without removing the meter cover, and conversely removal of the meter cover 
does not permit of access to the coin box. For convenience in reading the 
register and noting the number of coins to customer's credit, the coin register 
and meter dial face are combined, the hand indicating the coins to credit being 
directly above the register dials. The Type IP-3 was built in capacities like 
the IP-2 meter, and only adapted for use with a twenty-five cent coin. 

The Type IP-4 prepayment watthour meter differs from the IP-3 only in 
the construction of the mechanism which transmits motion to the contact making 
switch. In the Type IP-3 meter the actuating knob is attached directly to the 
main arbor. In the IP-4 meter a slotted cylindrical disk is mounted upon the 
end of the main arbor, which is thus actuated by a ' 'dog" attached to the knob. 

The Type CP prepayment watthour meter is in every respect similar to 
the Type C-6, except in the number of terminals and in the contact making 
register. It is built in capacities of 3, 5, 10, 15 and 25 amperes, 106 to 120, 212 
to 240 volts, two-wire, and 212 to 240 volts, three-wire. This type of meter 
may be used with either the Form 3 or Form 4 prepayment attachments. 

The ordinary Type C-6 meter is not adapted for operating in connection 
with these prepayment attachments since it lacks the terminals and the contact 
making register mentioned above. 

The Type CP-2 prepayment watthour meter is a combination of the 
"Wood" prepayment mechanism and the Type C-6 meter, the "Wood device" 
being adapted mechanically to this type of meter, similar to its adaptation to 
the Type I meter in the Type IP-2 meter. This type of meter was built in 
capacities of 3, 5, 10, 15 and 25 amperes, 100 to 120, 200 to 240 volts, two-wire, 
and 200 to 240 volts, three-wire, and could be adapted for either a ten or twenty- 
five cent coin. The Type CP-2 meter was finished in black japan, the cover as 

26 



in the Type C-6 meter being provided with a glass window for reading the meter 
register. 

The Type CP-3 prepayment meter is the superseding redesign of the CP-2, 
being the direct current prepayment meter corresponding to the alternating 
current meter, Type IP-3. It is similar to the IP-3 as regards its prepayment 
mechanism, the direct current meter of modified Type C-6 construction being 
housed in the same case with the prepayment device. This type of meter was 
built in capacities of 5, 10, 15 and 25 amperes, 100 to 120, 200 to 240 volts 
two-wire and 200 to 240 volts three-wire, and is only adapted for use with a 
twenty-five cent coin. The meter was finished in dull black japan, the cover 
being fitted with a window to permit of reading the meter dial and the coin 
indicator. 

The Type CP-4 meter differs from the Type CP-3 only in the manner of 
actuating the prepayment mechanism, the difference being described under the 
Type IP-4 meter. 

The Form 3 prepayment device used in connection with Types IP and CP 
meters is one of the well known " Wood " devices and was used interchangeably 
upon direct and alternating current circuits up to 60 cycles. This device 
consisted of the prepayment mechanism, the contact making switch and the 
electromagnet which operated whenever energy to the value of a coin was 
consumed, causing the coin mechanism to release to the next digit below indi- 
cating one less coin to customer's credit. This form of device was finished 
in bright japan, the coin chute being polished brass. The Form 3 device 
could be furnished for use with either dime or quarter coin. 

The Form 4 prepayment device is a radical redesign of the Form 3 device 
which it supersedes. Like the Form 3, it is interchangeable upon direct or 
alternating current up to and including 60 cycles. This device consists of a 
prepayment mechanism and contact making switch both of which are a marked 
improvement in both design and construction over the older Form 3 device. 
The principle of the coin releasing mechanism is the same as in the Form 3 
device, except that the number of coins to customer's credit is indicated by a 
pointer which traverses a porcelain dial. As energy to the value of a coin has 
been consumed, this pointer travels back one digit, this motion being actuated 
by the electromagnet. The Form 4 device is finished in dull black japan and 
is adapted only for use with a twenty-five cent coin. 

TYPE W MAXIMUM WATT DEMAND INDICATORS 

The Type W maximum watt demand indicator is used to indicate at any 
instant the amount of power being delivered and the maximum amount of 
power that has been delivered to a circuit, subject to a certain arbitrary time lag 
incorporated in the indicator. This time lag prevents the indicator from record- 
ing any instantaneous overload or short circuit which may occur. 

It is for use upon alternating current, three- wire two- and three-phase and 
monocyclic, four-wire two- and three-phase circuits and is built self-contained in 
capacities of 5, 10, 15, 25, 50, 75, 100 and 150 amperes, 106 to 120, 212 to 240, 

27 



400 to 480, 500 to 600 volts, 25 to 140 cycles, for use on three-wire two- and 
three-phase and monocyclic circuits and four- wire, two-phase circuits and in 
capacities of 5, 10, 15 and 25 amperes, 25 to 140 cycles, for use upon 4-wire, 
3-phase circuits. 

This indicator is finished in dull black japan, the cover being provided 
with a circular glass window for noting the position of the pointers. The leading 
in wires enter into binding posts located at the sides of the indicator. This 
indicator can also be furnished with studs for back connection in either the 
Type DS-4 or DS-5 meter style. 



DETAILED INSTRUCTIONS FOR TESTING 

VARIOUS TYPES OF THOMSON 

WATTHOUR METERS 

TESTING TYPE I SINGLE-PHASE WATTHOUR METERS 

In testing a two-wire meter by means of instruments, connect according 
to Fig. 11 and if by a rotating standard according to Figs, on pages 17.7 and 178. 
Three-wire meters may be tested as two-wire upon either a two- or three-wire 
circuit by connecting the current coils in series and if testing is to be done upon 
a three-wire circuit by connecting the load on one side of it ; following in general 
the method of testing outlined for two-wire meters. 

Operation No. 1 

At full load power-factor unity adjust meter correctly by means of the 
magnets. Moving same toward the shaft increases, and away from the shaft, 
decreases its speed. When testing by means of instruments the formula given 
on page 13 should be used. When testing by means of rotating standards the 
formula as given on page 14 should be used for this operation. Divide the* 
constant marked upon the meter disk by 2 if a three-wire meter is being tested. 

Operation No. 2 

At one-half load power-factor unity read meter taking an observation of 
not less than 30 seconds. 

At full load current power-factor 0.5 read meter taking the same number 
of revolutions as before. 

Any small difference that may exist between these readings may be com- 
pensated for by means of the adjusting resistance in series with the lag coil. 

When testing a meter on the customer's premises, it may be desirable or 
necessary in the absence of inductive load to omit this operation trusting to the 
accuracy of the original adjustment. 

28 



Operation No. 3 

At 5 per cent, load or less (in accordance with local practice) at power- 
factor unity, adjust meter on light load. This adjustment is obtained by 
varying the position of the starting plate, the proper direction in which it is 
to be moved to affect the necessary adjustment being indicated upon the meter. 

Operation No. 4 

At full load power-factor unity repeat operation No. 1. A slight change 
in adjustment may be necessary particularly if it was necessary to change the 
adjustment of either of the other two operations to any marked degree. 

METHOD OF CONNECTING A TYPE I WATT- 
HOUR METER AND INSTRUMENTS FOR 
TESTING PURPOSES 




Fig. 11 • 

V Voltmeter 

WM Watthour Meter under Test, Two-Wire 

IW Indicating Wattmeter 

A Ammeter 



TESTING METERS IN SERIES 

To permit of any number of meters being tested in series without recording 
the losses of their potential circuits, a testing loop or wire from the potential 
coil is brought out, which in actual operating service is connected to one side 
of the line. The service connection should be disconnected and a connection 
made to the wire from the potential coil to the source of potential at a point 
before current enters the first meter of the series. Refer to Figs. 12 and 13. 

29 



CONNECTIONS OF TYPE I WATTHOUR METER, 
FOR TESTING PURPOSES, TWO-WIRE 




Fig. 12 

Note — In the above diagram, it will be noted that the upper left hand 
binding post is not used. 



CONNECTIONS OF TYPE I WATTHOUR METER, 
FOR TESTING PURPOSES, THREE-WIRE 



tf 



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Fig. 13 

30 



TYPE 1-10 METERS 

In general, Type 1-10 meters are tested in the same manner as the Type 
I meters with the following exceptions: 

Full load adjustment is accomplished by shunting more or less of the mag- 
netic flux straight across the poles of the permanent magnet by means of an 
iron screw in the air gap. Turning this screw in speeds the meter and con- 
versely turning the screw out slows the meter. A clamping device is 
provided for holding this adjustment when once obtained. The iron pole 
piece below the disk is not for adjusting full load and under no circumstances 
should it be removed from the frame. 

Light load adjustment is accomplished by means of a movable starting 
plate which is released by a brass clamping screw to the right of the shaft as 
one faces the meter and almost directly in line with the first pointer. The 
light load adjustment is then obtained by the two knurled headed brass screws 
which project through the meter frame on either side. 

As one faces the meter, the screw to the right is marked with the letter F 
and an arrow indicating the direction in which the screws are to be turned in 
order to speed the meter. To slow the meter the screws must be turned in the 
opposite direction. Both screws must be turned forward or backward at the 
same time. The above may be clearly seen in Fig. 14. 

The meter is adjusted at the factory to record correctly on inductive loads 
by means of a lagging plate which is permanently fastened to the laminated iron 
core and which is directly in the path of the flux of the potential circuit. 



31 



THOMSON SINGLE-PHASE WATTHOUR METER 
TYPE 1-10 



! 1/gM Load 
Adjusting Scnsw 



Lig/itLoocf 
Adjusting Screw 



Testing Loop* 




damping 
Screw 



Storting 
Plate 



Fig. 14 

Cover, register, magnet, moving element and part of frame removed to 
show operation of light load adjustment. 



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40 



METHOD OF TESTING THOMSON POLYPHASE 
WATTHOUR METERS 

The following outlines and diagrams explain the manner in which Thomson 
polyphase watthour meters may be tested upon a single-phase circuit. 

FOUR- WIRE THREE-PHASE METERS, WITH THREE 
CURRENT AND TWO POTENTIAL ELEMENTS 
Operation 1 

Excite the current circuit of the upper element and potential circuits of 
both elements. If meter has been previously adjusted at any time, leave 
magnets in position. If not, place magnets in an approximately correct posi- 
tion, moving both sets about equally. 

With meter connected as above, at one-half load, power-factor unity, read 
upper element. 

With the same connection, at full load current, power-factor 0.5, read 
inductive load on upper element. By means of the left-hand lag wire (facing 
meter) the readings obtained upon inductive load should be made to check 
within the required limits of the readings obtained on non-inductive load. 

Operation 2 

Excite the current circuit of the lower element leaving the potential 
circuits of both elements excited. At one-half load, power-factor unity, balance 
the lower element with the upper by means of the taps of the lower reactive 
coil. This element should be adjusted so that the reading obtained will check 
within required accuracy limits of the corresponding one-half load reading 
obtained upon the upper element. 

With this same connection, at full load, power-factor 0.5, read inductive 
load on lower element. By means of the right-hand lag wire (facing meter) 
the readings obtained upon inductive load should be made to check within 
the required limits of the readings obtained on non-inductive load. 

Operation 3 

Excite middle current element, leaving potential circuits of upper and 
lower elements excited. At one-half load, power-factor unity, read meter. 
If other operations have been carefully carried out, the meter will make twice 
the number of revolutions in the same time as when corresponding load passed 
through either the upper or lower element. 

Operation 4 

Connect current elements in series exciting both potential elements, and 
at power-factor unity load meter to its full rated capacity and adjust at this 
load by means of the magnets, moving both the upper and lower sets about 
equally. When the meter is connected as above, the constant marked upon 
the meter disk should be divided by 4. Assuming that a 5 amp., 220 " A " volts 
127 "Y" volts 60 cycle meter having a calibrating constant of 1.25 is to be 
tested, the formula for testing, with instruments, becomes 
3600X0.3125X25 (revs.) 



635 (full load watts) 

41 



=44.3 (seconds). 



Operation 5 

Connect the meter as in operation (1) exciting only the potential circuit 
of the upper element. At the desired light load, 5 per cent, to 10 per cent, of 
full load, power-factor unity, adjust upper element on light load, the adjustment 
being obtained by moving the upper light load plate. Moving the light load 
lever toward the top bearing increases the speed and away from the top bearing 
decreases the speed. For this operation the constant marked upon the meter 
disk should be used. 

Operation 6 

Connect meter as in operation (2) exciting only the potential circuit of 
lower element. Repeat tests outlined in operation (5). 

Four-wire, three-phase meters are rated both with delta and "Y" voltage, 
the meter constant being determined by the voltage between lines which is 
called the "delta" voltage. The calibrating voltage, or voltage on the meter 
is the delta voltage divided by square root of 3, i.e., it is the voltage between 
neutral and either of the lines. 

In the case of meters with potential transformers, the latter are connected 
between the neutral and the lines, which is the equivalent of the practice upon 
secondary meters. 

THREE- WIRE, TWO- AND THREE-PHASE AND FOUR- 
WIRE, TWO-PHASE METERS 

In testing three-wire two- and three-phase and four-wire two-phase poly- 
phase watthour meters, operations 1, 2, 5 and 6 of the four-wire, three-phase 
method of testing should be carried out. 

Operation 3 

Connect the current elements in series, exciting both potential elements, 
and at power-factor unity, load meter to its full rated capacity and adjust at 
this load by means of the magnets. When the meter is connected as above, the 
constant marked upon the meter disk should be divided by 2. Assuming that 
a 5 amp., 110 volt, 60 cycle meter having a meter constant of 0.6 is to be tested, 
the testing formula, using instruments becomes 
3600 X0.3 X25 (revs.) 



550 (full load watts) 



= 49.1 (seconds) 



Operations 4 and 5 correspond to operations 5 and 6 respectively, in the 
testing of four-wire three-phase meters. 

It is desirable to check polyphase watthour meters finally upon light loa( 
with all the current coils in series and with both potential coils excited in the 
same manner that the full load was checked. Any necessary final adjustment 
of the light load may be made by means of either of the light load levers. 

Note: — Rotating standards can be used to advantage in testing, especially 
where the voltage, and therefore the load, is variable. 

42 



CONNECTIONS OF A FOUR- WIRE THREE-PHASE 

WATTHOUR METER FOR TESTING UPON A 

SINGLE-PHASE CIRCUIT FOR METERS 

WITH THREE CURRENT AND 

TWO POTENTIAL 

ELEMENTS 



D/scorvec ■/■ So/~ s 



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This diagram covers only back connected meters whose potential circuits 
re independent of the current. In the case of front connected primary 
leters, connections should be made to the corresponding binding posts. For 
ont connected secondary meters, disconnect testing loops and make 
otential connections to leads of the potential coils. 



43 



CONNECTIONS OF A THREE-WIRE TWO- OR| 

THREE-PHASE OR FOUR-WIRE TWO-PHASE 

WATTHOUR METER FOR TESTING UPON 

A SINGLE-PHASE CIRCUIT 



FRONT VIEW 






\ 



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This diagram covers only back connected meters whose potential circuits 
are independent of the current. In the case of front connected primary 
meters, connections should be made to the corresponding binding posts. Foi 
front connected secondary meters, disconnect testing loops and make 
potential connections to leads of the potential coils. 



44 



CONNECTIONS OF A THREE-WIRE TWO- OR 

THREE-PHASE WATTHOUR METER WHEN 

CHECKING BY MEANS OF SINGLE-PHASE 

PORTABLE TEST METER 




Note. — From these sketches the corresponding connections for four-wire, 
two- or three-phase meters and for primary meters will be apparent. 

45 



CONNECTIONS OF A THREE-WIRE TWO- OR 
THREE-PHASE WATTHOUR METER WHEN 
CHECKING BY MEANS OF SINGLE- 
PHASE PORTABLE TEST METER 




Fig. 19 



This diagram shows method of testing with the elements connected in 
series. 

Note. — In a secondary meter as shown above, testing loops should be 
disconnected and potential connections made to the wire from the potential 
coil. In a primary meter, potential connections should be made to the poten- 
tial posts. 

From this sketch the corresponding connections for 4-wire 2- or 3-phase 
and for primary meters will be apparent. 



46 



CONNECTIONS OF A THREE-WIRE TWO- OR 

THREE-PHASE WATTHOUR METER WHEN 

CHECKING, BY MEANS OF INDICATING 

INSTRUMENTS 



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A Indicating Ammeter 



47 



TESTING DIRECT CURRENT WATTHOUR METERS 

Rotating standards can be used to advantage in the testing of direct current 
watthour meters, especially if the load is unsteady. 

Before testing direct current watthour meters, it is advisable to allow 
them to run for at least twenty minutes in order to allow their potential circuits 
to heat up to their normal temperature. 

Operation 1 

Adjust meter on full load, adjusting by means of the front and back set 
of magnets. The formula for this operation when instruments are used is as 
quoted in previous tests. 

3600 XK XR 

=time. 

watts 

Operation 2 

Adjust meter on light load (one-twentieth of full load), by means of the 
adjustable shunt field coil. 

Moving the shunt field coil into the field of the armature assists rotation 
and consequently speeds the meter while, conversely, moving the coil out of the 
field lessens its effect and tends to slow the meter. 

The shunt field coil holders of Types C-5, C-6, C-7, C-9 and CR watthour 
meters are constructed so that the adjustment is obtained by swinging the 
coil and holder upon its supporting stud which is attached to the frame. 

Three-wire meters may be tested as two-wire, by connecting the fields 
in series, the constant marked upon the disk being divided by 2. By discon- 
necting the potential wire which is grounded to the current coil terminal, and 
making a connection to this wire and to the other terminal to which the 
opposite side of the potential circuit is grounded any number of meters may 
be tested in series without recording the losses in the potential circuit. 

The same general method of testing also applies to the Types CS, G-2 
and G-3 meters. 

To facilitate testing, the magnetic shield may be removed, but the meter 
should receive its final check with the shield in position. 

ARMATURES 

All standard direct current Thomson watthour meters with spherical 
armatures, except Types CQ and CQ-2, take the same armature differing only 
in the length of the leads. 

The following description will assist in assembling a new armature into a 
meter. 

First, loosen the check nut upon the jewel screw bushing and unscrew the 
jewel and the bushing as a unit. Remove the pivot and register, disconnect 
the leads and carefully remove the brushes. 

Next, remove the shunt field coil, front series coil, and, the front set of 
magnets. The entire moving element may then be withdrawn from the meter. 

Remove the disk from the shaft and unsolder leads from the commutator. 

48 



Insert a very small screw driver through the holes provided for this purpose 
in the armature core and unscrew the clamping screw in the armature sleeve 
or, if the armature be clamped to the meter shaft externally, loosen the clamping 
screw before attempting to remove the armature. 

Withdraw the armature from the lower end of the shaft. 

The ends of the commutator segments should then be carefully cleaned, 
if necessary using a piece of well-worn crocus cloth. 

Next, slip new armature on the shaft taking care to see that the clamping 
screw has been loosened beforehand so that the shaft will be neither strained 
nor bent in sliding on the new armature. 

Adjust armature correctly on shaft gauging its position by setting the 
shaft in position in the meter. The armature should rotate freely within the 
back field coil and should be located as nearly as possible in the center. When 
the correct position has been obtained bring the armature to a position on 
the shaft so that its leads are directly under the commutator segments, i.e., 
that the leads run straight up. Thus, in Type C armatures a lead starting 
from the junction of two armature coils connects to the commutator bar 
directly above it. In a correctly mounted armature the eight commutator 
bars will be directly in line with the eight openings in the armature core between 
coils as may be noted by sighting along the armature with the pivot end towards 
the eye. Any variation from this correct position will reduce the torque, 
causing the meter to run slower. In fact, a test for the correct setting of the 
"armature lead" consists in moving the armature slightly, first in one direction, 
then in the opposite direction. If the speed is reduced in either case, the 
armature was set correctly. In other words, the correct position of the arma- 
ture is at the point of maximum torque. 

When all necessary adjustments have been obtained, clamp the armature 
firmly upon the shaft. 

Cut off armature leads to the desired length and solder leads to commutator 
segments, using only a soldering flux composed of rosin and alcohol. 

Armatures may be assembled into Types CS, G-2 and G-3 meters in the 
same general manner. 

In assembling armatures into meters of the types referred to above, the 
leads of the bottom armature should be given a half turn to the right, around 
its insulating sleeve, and brought straight up to a commutator segment. Another 
method of accomplishing the same result is to first connect all leads direct to 
the commutator segments and then turn the lower armature to the left 180 
degrees. 

Upon the lower end of the sleeve of the top armature for Types G-2 and 
G-3 meters is mounted a small wooden bushing with eight small holes drilled 
in it. In bringing up the leads of the lower armature to the commutator, 
they should pass through these holes. In all cases, it is recommended that the 
original construction, position and adjustment of parts be carefully noted that 
the new parts may be similarly assembled. 



49 



TYPE I THOMSON SINGLE-PHASE HIGH 
TORQUE WATTHOUR METER 




Fig. 22 



50 



INTERIOR VIEW OF TYPE I THOMSON SINGLE- 
PHASE HIGH TORQUE WATTHOUR 
METER 




Fig. 23 



51 



DIMENSIONS OF TYPES I AND IP THOMSON 
SINGLE-PHASE WATTHOUR METERS 

3 to 25 Amps., 106 to 120, 212 to 240, 500 to 600 Volts, 25 
to 140 Cycles, 2-Wire, With and Without Transformers 



f§'"0/6 




JEl 



tD 



'/* <£JV/re jv/t/)Ou£ Transformer 



J2L 



^4 2W/r<? w/t>hPot7ra/7s/or/r?er 
2 lV/r& nv&/7 Ci/cr7h7s*s/b/77?er 
2 Wire w/tfibothCt/rr&^o/ Trons&r/T/er- 



Fig. 24 



52 



DIMENSIONS OF TYPE I THOMSON SINGLE- 
PHASE WATTHOUR METERS 

50 to 100 Amps., 106 to 120, 212 to 240, 500 to 600 Volts, 25 to 

140 Cycles, 2-Wire, With and Without Transformers 

50 to 100 Amps., 212 to 240 Volts, 25 to 60 Cycles (Single Lag 

Adjustment), 3- Wire, Without Transformers 




(k 



: 



P 







-«-* 



2 Hf/r-e 50ar7c/ 75 ^^?p. 
W/f/hoc/f 7r-oms/arvr?ejr 



2 W/re> 50 asitf 75/?sr?/?. 
iv/Yfr Pot Tr&s?sforrr? er~ 








a r^-^ 



2 W/r-e /OOs?sr7/>. 



2W/r~€> /00/?s?yp 
w/f/7 fot. 7r<7r?si g br/r7&r' 




3 W/r-e /OOsfmp. 



Fig. 25 



53 



DIMENSIONS OF TYPE I THOMSON SINGLE- 
PHASE WATTHOUR METERS 

50 to 100 Amps., 212 to 240 Volts, 125 to 140 Cycles (Double 

Lag Adjustment), 3- Wire, Without Transformers 
150 Amps., 106 to 120, 212 to 240, 500 to 600 Volts, 25 to 140 

Cycles, 2- and 3-Wire, Without Transformers 
200 and 300 Amps., 106 to 120, 212 to 240, 500 to 600 Volts, 
25 to 140 Cycles, 2- Wire, Without Transformers 



K^S 




■1 £r 



3M//r-e>50 fo/504s7?o 



4> 

Q 



<ssec/ or) SOS- 7Ss7rry> . 
Th/'s I eac/a£&c/&rf/7 Pot 7r<7/7sfbsy7? eron/> 




2 IVire /SO/trT?^. 



£ W/>-e 200ar?c/300J/r?p. 



Fig. 26 



54 



EXTERNAL CONNECTIONS OF TYPE I THOMSON 
SINGLE-PHASE WATTHOUR METERS 

3 to 300 Amps., 106 to 120, 212 to 240, 500 to 600 Volts, 25 to 
140 Cycles, 2-Wire, Without Transformers 

Source 



M. 



o 



&- 



3+et00/fr7V>S, 



Fig. 27 



Source 



M. 



<§> 4) 



/50*0 3OOA0?/>S. 



Fig. 28 



55 



EXTERNAL CONNECTIONS OF TYPE I THOMSON 
SINGLE-PHASE WATTHOUR METERS 



Source 



MOM 



fron+ \//euv 



M. 



CX 



□ 



& 



-4> 



Z.oac/ 
Soi/rc& 



All capacities above 300 Amperes. 
Below 600 Volts. 

Fig. 29 



B 



M. 



O 



<£>- 



■4 



/.oatr 



All capacities above 650 Volts 
Fig. 30 



56 



EXTERNAL CONNECTIONS OF TYPE I THOMSON 
SINGLE- PHASE WATTHOUR METERS 

3 to 150 Amps., 212 to 240 Volts, 25 to 140 Cycles, 3-Wire 
Without Transformers 

FRONT VIEW 



Source 



_/3l 



O 



b- 



-4> 



fifev+na/ 



3 to 25 Amps. 25 to 140 Cycles 
50 to 100 Amps. 25 to 60 Cycles 

Fig. 31 



/.oacf 



Source 



J3L 



□ 



!>- 



-<& 



Neu+ro/ 



50 to 100 Amps. 125 to 140 Cycles 
150 Amps. 25 to 140 Cycles 

Fig. 32 



loacf 



57 



EXTERNAL CONNECTIONS OF TYPE I THOM- 
SON SINGLE-PHASE WATTHOUR METERS 

Above 150 Amps., 212 to 240 Volts, 25 to 140 Cycles, 3-Wire 
With Form DM- 16 Current Transformer 

FRONT VIEW 




Z. o a cz/ 



Fig. 33 



58 



EXTERNAL CONNECTIONS OF TYPE I THOMSON 
SINGLE-PHASE WATTHOUR METERS 

Above 150 Amps., 212 to 240 Volts, 25 to 140 Cycles, 3-Wire 
With Current Transformers 



*E 



M. 



CZZ) 
□ 

fr Kg 



Fig. 34 

Note — This method supersedes method shown on page 58. 



59 




60 






W 

CO 

H 

I 

w 

>-) 
o 

O 

o m 



hW 

H 

O 

w 

to 
o 
o 

g 

H 



O !h 
O 



P * ^ 



-^ o 



o'S W 

Ofl H 

10 5 > 

© H ^ 



s 




w 

a 

i 

w 

Hi 

o 
to 

to 
O 

gg 

hH 
W^ 

gg 

o 

w 

to 
to 
o 
o 

<! 

to 

W 

H 

to 



£ 



^ > 

o 

>M 
oO 
o <j 
° QQ 



0< 

s 

<3 




INTERNAL CONNECTIONS OF TYPE I THOMSON 
SINGLE-PHASE WATTHOUR METERS 

200 to 300 Amps., 106 to 120, 212 to 240, 500 to 600 
Volts, 125 to 140 Cycles, Without Transformer 

BACK VIEW 




c®« 



200-300 Amps. 
Fig. 41 



63 







a 


w 




u 


<r> 




**-t >» 


< 




co*-* 


W 




«jO 


ft 

1 




<t> 


w 




13 s 








& 




"Sg 


*-* 

CO 




ft a 


te 




>«_> wj 


o 






r/> 




H <t> 


o 
W 

H 


CO 
ft 

w 


w So 

"11 


i— i 


W 


*>W co 


ft 


S 


Oh £ 


ft 


ft 




H 


& 


r co 

CO *H **H 


En 
O 


o 
W 

H 


p,o o 
S » 2 


r/J 


H 


o^S 


O 


£ 


to fl 
o o 


H 




o 


O 




0) CO 

rt o 


te 
& 




9^ 




0(W 


o 






o 




o . 
43 bO 


►J 




cos 


< 




oT 


ft 




^ O 


w 




r^ 


H 




« *1 


fe 




~* o 


(— I 








CO 

< 
a 

i 

w 
O 

O 

S 

cw 

H H 
W^ 

* § 

cot3 

l-H 

H 
O 
W 

o 
o 

H 



8> 

s»PQ 
O 



S 




.9 S 



65 



INTERNAL CONNECTIONS OF TYPE I THOMSON 
SINGLE-PHASE WATTHOUR METERS 

3 to 100 Amps., 125 to 140 Cycles, 2- Wire, With Either Current 
or Potential Transformer 

BACK VIEW 




Double Lag Adjustment 
Fig. 46 



66 



XIX 

O § 
V) 13 



O 
CO 

i§ 

H H 

« W 

few 

Oh 

H 
O 

W 
& 

o 
o 

g 

w 

H 



a> 






6 




< 
M 

°f 
w 

o 
to 

CO 
O 

CO 

81 

hW 

coH 

H 
O 

w 

o 
o 

H 



o 



»— i 
o > 

VO 







2 5 



h* 3 



w 

'H 






< 



o 

CM 



a. 

6 

o 
o 




69 



m 

CO 

W g 

7 3 

S i 

CO ^ 

o 

.a 



£ 



o 
WW 

Hi=> 
coH 

H > 

§ 
W n 

1 ° 

^ CM 

8 s . 



CO 



o 





a. 

a 


fc 


<* 


« 


o 


w 


10 


H 






•a ^ 



fc§ 



70 




71 




H o 

ft) M 

S -8 

O 3 

O r 

to 

S ° 



00 T^ 






•3 * 



to 73 



fa ^ 



CONNECTIONS OF TYPE I THOMSON SINGLE- 
PHASE WATTHOUR METERS 

SHOWING METHOD OF MAKING CONNECTIONS FOR 
DOUBLE LAG ADJUSTMENT 



M. 






a 



n 



Fig. 59 



Double Lag Adjustment 

This sketch shows the connections made for the higher of the two frequencies . 
[f it is desired to run the meter on a lower frequency, disconnect the wire A 
:rom B and solder A to_C. Make a soldered connection between D and E. 
No other change is required except that it may be necessaryHo readjust the 
itarting device. 



73 



CONNECTIONS OF TYPE I THOMSON SINGLE- 
PHASE WATTHOUR METERS 

SHOWING METHOD OF MAKING CONNECTIONS FOR 
TESTING UPON SEPARATE POTENTIAL 




3 to tOOamps. /SOa/ryps. 

2 and 3 wire. 2 and 3 wire. 






& 



^ 



200 and 300 anops. 2w/re. 
Fig. 60 

Separate Potential Connections 

If it is desired to test with separate potential connections, disconnect H and J. 
Connect J to one side of the source. In two-wire meters and in three-wire 150 
amp. meters, connect the opposite side of source to upper right-hand terminal. 
In three-wire meters 3 to 100 amps, connect opposite side of source to central 
right-hand terminal. 



74 



TYPE 1-8 THOMSON SINGLE-PHASE HIGH 
TORQUE WATTHOUR METER 




Fig. 61 



75 



INTERIOR VIEW OF TYPE 1-8 THOMSON SINGLE- 
PHASE HIGH TORQUE WATTHOUR METER 




Fig. 62 



76 



DIMENSIONS OF TYPE 1-8 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

3 to 25 Amps., 106 to 120, 212 to 240, 500 to 600 Volts, 2-Wire 
and 212 to 240 Volts, 3-Wire, 25 to 140 Cycles, With 
and Without Transformers 



/e 



s — Ffr 



<n 



ik=± 






tp ^ 



ft 



5i& 



7> 



I 



II 



*3Z 



3tY/re 3- 2 5 /?*?/> 





2 Wtre 3-2Srfm/> 



2rY/re 3-2S/fm/>. 
rY/th Transformer. 



Fig. 63 



77 



DIMENSIONS OF TYPE 1-8 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

50 to 75 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 

2-Wire, and 212 to 240 Volts, 3-Wire, 25 to 

140 Cycles, With and Without Transformers 



J'ho/& 



'6q 



* /? <?/< ? 



± 



/6 




ffi 






> ^ 



W 



-7& 

/6 



5fi{ 



w 



w 



3tY/re - S0-7S/fsnf>. 



■ft 



tni 






m- 




2 Mfrre 50-7f/4rn>p 



Fig. 64 

78 



Mfrih frans former. 



CO 

«! 
H 

i 

o 

CO 

o 

CO 

o 

w 

H w 
cog 
M H 

W 2 

*2 

H 
coH 

H 

O 
W 

ft 

& 
O 

o 

§ 

w 

H 

XI 

m 




s-a 
N ft" 

o w O 9 

©S3 

in *>'£ 

4 5u 










u 



o 

<M< 



O 

2o 

O CO 

.» 8 2 



>>Ctf 

3 ft S 

CM W 



CQ 






< 



l* 



CM 



UO 




° w 2 

CM <M O 

o >■ IT 1 ** 

.28 s_S 



09 >» G 
Q«© rj c8 

«io H 



•CM O 






79 



i 

w 

o 

O 

o 
w 

&g 




£ 



fn 



w 



O 

o 

w 

o 

O 

g 

H 
H 

X 
W 




"^ o 
o^ r 



<M 



w w at 

in +-> 
o c^ 

CO 



80 




81 




82 



CONNECTIONS OF POTENTIAL CIRCUIT OF TYPE 
1-8 THOMSON SINGLE-PHASE WATTHOUR 
METERS 

Showing Method of Making Connections for Double Lag 

Adjustment and of Making Connections to the 

Terminals 

FRONT VIEW 




A/ote.-One enct of the non- 
/nc/uct/Ve res /stance must 
£>e so/cterect to that tqp 
p/Wna best /-esu/ts/n test. 
for /o*rer freauency 4 
must be so/a'erect to C, 
a/so O ana 1 £ must bo so/o'- 
er ect together /or h/gher 
frequency, s4 mast be so/ct- 
erea' to 3, ana* P ana' £ 
must be /eft open. 



A/ 




Fig. 74 



All two-wire meters, post No. 3 is omitted. 

Two-wire meters without trans., connect M to 4, N to 5. lype 1-* 
Two-wire meters with trans., connect M to 2, N to 4. Type 1-8. 
Three- wire meters without trans., connect M to 3, N to 5. Type I- 

83 



CONNECTIONS OF POTENTIAL CIRCUIT OF TYPE 

1-8 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Showing Method of Making Connections for Double Lag 
Adjustment and for Separate Potential Testing 



i& 




Fig. 75 



For lower frequencies A must be soldered to C and D to E. For higher I 
frequencies A must be soldered to B and D and E left open circuited. I 

Testing Loop: If it is desired to test meter on separate potential circuit, | 
M and N should be opened and line connection made to N. 

84 



TYPE IP-2 THOMSON SINGLE-PHASE PRE- 
PAYMENT WATTHOUR METER 




Fig. 76 



85 



INTERIOR VIEW OF TYPE IP-2 THOMSON 

SINGLE-PHASE PREPAYMENT 

WATTHOUR METER 




Fig. 77 



86 



DIMENSIONS OF TYPE IP-2 THOMSON SINGLE- 
PHASE PREPAYMENT WATTHOUR METERS 

3 to 25 Amps., 100 to 120, 200 to 240 Volts, 2- Wire, 200 to 
240 Volts, 3-Wire, 25 to 140 Cycles 



S"°L c iA 




J2W/re w/thou/- Transformer. 



Fig. 78 



87 



EXTERNAL CONNECTIONS OF TYPE IP-2 
THOMSON SINGLE-PHASE PRE- 
PAYMENT WATTHOUR METERS 

3 to 25 Amps., 100 to 120, 200 to 240 Volts 2-Wire, 200 to 
240 Volts 3-Wire, 25 to 140 Cycles 



source 




s o urc e 



Z-W?re 
Fig. 79 



3-W/r-e 



Fig. 80 

Internal circuit is from A to B and C to D. 



L0<7<* 




z o ar ct 



INTERNAL CONNECTIONS OF TYPE IP-2 THOM- 
SON SINGLE-PHASE PREPAYMENT WATT- 
HOUR METERS 

3 to 25 Amps., 25 to 60 Cycles, 2- and 3-Wire 
BACK VIEW 




Fig. 81 




w 
< 

w 
ft 

I 

w 
o 

CO 

coh 

OS 

ftH 
cog 

wS 

Sft 

o 
o 

ft 
ft 

H 



i-i 

? m 

o O 




a 




90 



TYPES IP-3 AND IP-4 THOMSON SINGLE-PHASE 
PREPAYMENT WATTHOUR METER 




Fig. 85 



91 



INTERIOR VIEW OF TYPE IP-3 THOMSON 

SINGLE-PHASE PREPAYMENT WATTHOUR 

METER 




Fig. 86 



92 



INTERIOR VIEW OF TYPE IP-4 THOMSON 

SINGLE-PHASE PREPAYMENT 

WATTHOUR METER 




Fig. 87 



93 



DIMENSIONS OF TYPES IP-3 AND IP-4 THOMSON 

SINGLE-PHASE PREPAYMENT WATTHOUR 

METERS 

3 to 25 Amps., 25 to 140 Cycles, 2- and 3-Wire 




/§//o/e 



£W/rc 



Fig. 88 
94 



EXTERNAL CONNECTIONS OF TYPES IP-3 AND 

IP-4 THOMSON SINGLE-PHASE PREPAYMENT 

WATTHOUR METERS 

3 to 25 Amps., 25 to 140 Cycles, 2- and 3-Wire 
Source 




3W/s-e 



Fig. 90 
95 



toacf 



INTERNAL CONNECTIONS OF TYPES IP-3 AND 
IP-4 THOMSON SINGLE-PHASE PREPAY- 
MENT WATTHOUR METERS 

3 to 25 Amps., 25 to 60 Cycles, 2- and 3- Wire 



r c=Q N ,Ct=« — i 







0=>i 



s: 



M 



^B\\\ 






Fig. 91 





97 



TYPE 1-10 THOMSON WATTHOUR METER 




Fig. 95 



98 



INTERIOR VIEW OF TYPE 1-10 THOMSON 
SINGLE-PHASE WATTHOUR METER 




Fig. 96 



99 



DIMENSIONS OF TYPE 1-10 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 5 to 15 Amps., 
212 to 240 Volts 3-Wire, 60 Cycles 



-2- 



-z£- 




-42- 



7~ 



f 



-♦ mi. 






Fig. 97 



100 



EXTERNAL CONNECTIONS OF TYPE 1-10 
THOMSON SINGLE-PHASE WATT- 
HOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 5 to 15 
Amps., 212 to 240 Volts 3- Wire 




Fig. 99. 3-WIRE 
101 



INTERNAL CONNECTIONS OF TYPE 1-10 
THOMSON SINGLE-PHASE WATT- 
HOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2- Wire, 5 to 15 
Amps., 212 to 240 Volts 3- Wire 



1SJA CI, 




Fig. 100 

Note — Arrows indicate direction of winding. When testing upon separate 
potential, disconnect wire "A" from "B" and connect wire from source to "A." 



102 



CONSTANTS AND REGISTER DATA FOR TYPES 

I, 1-8, IP, IP-2, IP-3 AND IP-4 THOMSON 

SINGLE-PHASE WATTHOUR METERS 

Capacities 3 to 50 Amps., 106 to 120, 212 to 240 Volts, 
25 Cycles 





AMPERES 






3 




5 


10 






o 






2 « 




o 




Volts 


u 




o . 


,_, 


+-> 


o . 




4-> 


o . 






oj 


a +* 




a3 


03 4J 


<L> 


03 


03 — ; 




tuM 


ti 


h-g 


©M 


* 


fe3 


tSM 


ti 


^3 




S 


bi 


*c3^ 


3 


bfl 


"3*5 


3 


bfl 


"dS 








Q 




0) 


Q 




CD 


Q 


106 to 120 


.4 


250 


t 


.6 


166f 


t 


1.25 


80 


t 


212 to 240 


.75 


133f 


t 


1.25 


80 


t 


2.5 


40 


t 



Volts 


AMPERES 


15 


25 


50 


106 to 120 
212 to 240 


2 

4 


50 
25 


t 


3 
6 


33| t 
16! t 


6 
12.5 


16f 

80 


1 
10 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



103 



CONSTANTS AND REGISTER DATA FOR TYPES I 

AND 1-8 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Capacities 75 to 300 Amperes, 106 to 120, 212 to 240 Volts, 
25 Cycles 



1 


AMPERES 




75 


100 


150 






o 






o 






o 




Volts 


u 


+j 


•-J <D -P 


u 


c3 


*-2 0) +->* 


fc 




^j (U-P 




3 


bo 

CD 


'A * 3 




bo 

CO 


c3 o^ 


ISM 


DO 

CD 




106 to 120 


10 . 


10 


t 


12.5 


80 


10 


20 


50 


10 


212 to 240 


20 


50 


10 


25 


40 


10 


40 


25 


10 



Volts 


AMPERES 


200 


300 




106 to 120 
212 to 240 


25 
50 


40 
20 


10 
10 


40 
75 


25 

131 


10 
10 









Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

tDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



104 



CONSTANTS AND REGISTER DATA FOR TYPES I 

AND 1-8 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Capacities 5 to 800 Amps., 1000 to 1200, 2000 to 2400 Volts 
25 Cycles 





VOLTS 




1000 to 1200 




2C00 to 2400 


Amperes 
























Meter 


Reg. 


Dial 
Face 


Meter 


Reg. 


Dial 
Face 




K 


Ratio 


Mult. 


K 


Ratio 


Mult. 


5 


6 


16% 


t 


12.5 


80 


10 


10 


12.5 


80 


10 


25 


40 


10 


15 


20 


50 


10 


40 


25 


10 


20 


25 


40 


10 


50 


20 


10 


30 


40 


25 


10 


75 


13 H 


10 


40 


50 


20 


10 


100 


10 


10 


60 


75 


13 H 


10 


150 


66% 


100 


80 


ICC 


10 


10 


20C 


50 


100 


100 


125 


80 


100 


250 


40 


100 


150 


200 


50 


100 


400 


25 


100 


200 


250 


40 


100 


500 


20 


100 


300 


400 


25 


100 


750 


13% 


100 


400 


500 


20 


100 


1000 


10 


100 


600 


750 


13 H 


100 


1500 


66% 


1000 


800 


1000 


10 


100 


2000 


50 


1000 



Meter K X 100 X Register Ratio =Xo. of watthours recorded by one 
revolution of the first pointer. 

tDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



105 



CONSTANTS AND REGISTER DATA FOR TYPES I, 
1-8, IP, IP-2, IP-3 AND IP-4 THOMSON SINGLE- 
PHASE HOUSE PATTERN WATTHOUR 
METERS 

Capacities 3 to 100 Amps., 106 to 120, 212 to 240, 500 to 
600 Volts, 40 and 50 Cycles 





AMPERES 




3 


5 


10 


15 






o 






o 


CD 




o 


CD 




o 


CD 


Volts 


<D 




o 


<u 






u 


03 




u 

CD 


-p 

oJ 






3M 


ti 


^3 


SM 


ti 


^3 


t>M 


P* 


^ 3 


«M 


tf 


^^ 




2 


bo 


*rt^ 


£ 


bfl 


*ajt§l 


2 


fao 


.ss 


2 


tab 


'A% 






o 

ti 


Q 




CD 


Q 




CD 


Q 




CD 


Q 


106 to 120 


.3 


333} 


t 


.5 


200 


t 


1 


100 


t 


1.5 


66^ 


t 


212 to 240 


.6 


166! 


t 


1 


100 


t 


2 


50 


t 


3 


33} 


t 


500 to'600 


1.5 


66! 


t 


2.5 


40 


t 


5 


20 


t 


7.5 


13} 


t 














AMPERES 








Volts 




















25 


50 


75 






100 


106 to 120 


2.5 


40 


t 


5 


20 


t 


7.5 


13} 


t 


10 


10 


t 


212 to 240 


5 


20 


t 


10 


10 


t 


15 


66! 


10 


20 


50 


10 


500 to 600 


12.5 


80 


10 


25 


40 


10 


40 


25 


10 


50 


20 


10 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



106 



CONSTANTS AND REGISTER DATA FOR TYPES I 

AND 1-8 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 
500 to 600 Volts, 40 and 50 Cycles 





AMPERES 




150 200 250 


300 






o 






o | 


o 






o 




Volts 


<dPh 

3 


4J 


*-H <U -P 


Ih 


+3 

03 k-j O+a 


u 




r-* CJ-M 


u 


4J 


r-J <D +->" 




(an 


'X. «J ^ 




to Qfe ^ 




bo 


03 o^ 


1uW 




5£| 






o 






<u 




<5 






<u 








rf 






rt 




tf 






tf 




106 to 120 


15 


66f 


10 


20 


50 10 


25 


40 


10 


30 


33* 


10 


212 to 240 


30 


33§ 10 ! 40 


25 10 


50 


20 


10 


60 


164 


10 


500 to 600 


75 


13| 10 100 10 10 


125 


80 


100 


150 


66| 


100 



Volts 



106 to 120 
212 to 240 
500 to 600 



AMPERES 



400 



40 

75 

200 



10 

10 

100 



450 



50 20 
100 10 
250 40 



10 

10 

100 



500 



50 
100 
250 



10 

10 

100 



600 



60 16$ 
125 80 
300 SSi 



10 
100 
100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

In all cases one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



107 



CONSTANTS AND REGISTER DATA FOR TYPES 
AND 1-8 THOMSON SINGLE-PHASE 
WATTHOUR METERS 

Capacities 5 to 400 Amps., 1000 to 1200, 2000 to 2400 
Volts, 40 and 50 Cycles 





VOLTS 


Amperes 


1000 to 1200 


2000 to 2400 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 


5 

10 

15 

20 

30 

40 

60 

75 

100 

150 

200 

300 

400 


20 

10 

66 % 

50 

33% 

25 

16% 

13 H 

10 

66% 

50 

33% 

25 


t 

10 

10 

10 

10 

10 

10 

100 

100 

100 

100 


10 

20 

30 

40 

60 

75 

125 

150 

200 

300 

400 

600 

750 


10 

50 

33% 

25 

16% 

13% 

80 

66% 

50 

33% 

25 

16% 

13% 


t 

10 

10 

10 

10 

10 

100 

100 

100 

100 

100 

100 

100 



Meter K X 100 X Register Ratio =No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



108 



CONSTANTS AND REGISTER DATA FOR TYPES I, 

1-8, IP, IP-2, IP-3 AND IP-4 THOMSON 

SINGLE-PHASE WATTHOUR METERS 

Capacities 3 to 50 Amps., 106 to 120, 212 to 240, 500 to 
600 Volts, 60 to 140 Cycles 





AMPERES 




3 


5 10 


Volts 


Meter 1 Reg. Dial 
K Ratio F ace 

Mult. 


Meter Reg. j *? ial 

K Ratio F r ace 

: Mult. 


Meter Reg. Dial 

K Ratio £ ace 

Mult. 


106 to 120 ! 
212 to 240 | 
500 to 600 | 


.2 500 t 

A 250 ! t 

1 100 t 


.3 3331 ! t 

.6 166§ t 

1.5 66| t 


.6 

1.25 
3 


166| t 
80 t 
331 t 



Volts 


AMPERES 


15 


25 


50 


106 to 120 
212 to 240 
500 to 600 


1 
2 
5 


100 
50 
20 


t 
t 
t 


1.5 

3 

7.5 


661 
331 

131 


t 
t 
t 


3 

6 

15 


331 t 
16! t 
66§ 10 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



109 



CONSTANTS AND REGISTER DATA FOR TYPES I 

AND 1-8 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Capacities 75 to 600 Amps., 106 to 120, 212 to 240, 
500 to 600 Volts, 60 to 140 Cycles 





AMPERES 




75 


100 


150 






o 






o 






o 




Volts 


. 


4J 




. 


"£ 




. 


4^ 








0} 


n ^-^ 




a$ 


*3 <° -^ 


<3 


c$ 


^ u +> 




uW 

a 


bo 






P* 
60 






p2 

bb 




106 to 120 


5 


20 


t 


6 


16f 


t 


10 


10 


t 


212 to 240 


10 


10 


t 


12.5 


80 


10 


20 


50 


10 


500 to 600 


25 


40 


10 


30 


33i 


10 


50 


20 


10 





AMPERES 


Volts 


200 


300 


600 


106 to 120 
212 to 240 
500 to 600 


12.5 

25 

60 


80 
40 
16 § 


10 
10 
10 


20 
40 
100 


50 
25 
10 


10 
10 
10 


40 

75 

200 


25 

13* 
50 


10 

10 

100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

t Dial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



110 



CONSTANTS AND REGISTER DATA FOR TYPE I 

THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Capacities 5 to 400 Amps., 1000 to 1200, 2000 to 2400 
Volts, 60 to 140 Cycles 





VOLTS 


Amperes 


1000 to 1200 


2000 to 2400 




Meter K| $£$ 


Dial Face 
Mult. 


Meter K 


Reg. \ Dial Face 
Ratio ; Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 


3 
6 

10 

12.5 

20 

25 

40 

50 

60 
100 
125 
200 
250 


33% 

16% 

10 

80 

50 

40 

25 
'20 

16% 
• 10 

80 

50 

40 


t 
t 
t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 


6 
12.5 
20 
25 

40 

50 

75 
100 
125 
200 
250 
400 
500 


16% t 
80 10 
50 10 
40 10 
25 10 
20 10 
13% 10 
10 10 
80 100 
50 100 
30 100 
25 100 
20 100 



CONSTANTS AND REGISTER DATA FOR TYPE 
1-10 THOMSON SINGLE-PHASE WATT- 
HOUR METER 

Capacities 5 to 25 Amps., 106 to 120, 212 to 240 Volts, 

2- Wire; 5 to 15 Amps., 212 to 240 Volts, 3-Wire 

25 to 133 Cycles 





AMPERES 




5 


10 


15 


25 


Volts 


u 

2 


.2 
*+> 

a 

bo 


0> 

o 

.$2 

Q 


M 

u 

t 

2 


JO 
+» 

bi 


O 

32 

Q 


M 

u 

•+J 
CD 

2 


.2 

tab 

0) 


u 

32 

Q 


M 

2 


.2 
bi 


o 
Q 


106tol20 
212to240 


.25 
.5 


400 
200 


t .5 
t 1. 


200 
100 


t 
t 


.75 1133% 
1.5 I 66% 


t : 1.25 
t 25 


80 
40 


t 
t 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 

Ill 



TYPE IS THOMSON SINGLE-PHASE 
WATTHOUR METER 




Fig. 101 



112 



TYPE IS-2 THOMSON SINGLE-PHASE 
WATTHOUR METER 




Fig. 102 



113 



INTERIOR VIEW OF TYPE IS-2 THOMSON 
SINGLE-PHASE WATTHOUR METER 




Fig. 103 



114 



TYPE IS-3 THOMSON SINGLE-PHASE 
WATTHOUR METER 




Fig. 104 



115 



« 









o 


CO 


ffl 




s 


H 


H 





55 


CO 

a 

ctf 


£ 




H 


W 




(/J 


3 


< 





ffl 


4-! 


ft 


£ 


w 


*tf 


k) 


a 


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fc 


-»-» 




£ 


feco 


CO 


o«£ 


r/>« 


1 


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w § 


a 

1 


H 


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CO 


C/5 


CO 


hH 





W 




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O 


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/ ■ X 



I 1 



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^«CS|>J ^ 




116 



DIMENSIONS OF TYPE IS-2 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

5 to 150 Amps., 106 to 120, 212 to 240, 400 to 480 Volts, 25 to 
140 Cycles, With and Without Transformers 



r-y 



*>!<& 






TT 






JL 



I 

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d d d 

n,Vaon(coHe« 



o< 



1 ^ 



117 



DIMENSIONS OF TYPE IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

5 to ISO Amps., 106 to 120, 212 to 240, 400 to 480 Volts, 
25 to 140 Cycles, With and Without Transformers 




00 —I 

4&? 



"T 



5 






2l* 

^K 1 










I 



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.s .s .s 

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118 



[NTERNAL CONNECTIONS OF TYPE IS THOMSON 
SINGLE-PHASE WATTHOUR METERS 

3 to 75 Amps., 25 to 140 Cycles, With and Without 
Transformers 
FRONT VIEW 




Fig. 108 



119 



INTERNAL CONNECTIONS OF TYPE IS THOMSON 
SINGLE-PHASE WATTHOUR METERS 

3 to 75 Amps., 25 to 140 Cycles, 3-Wire, Without 
Transformers 

FRONT VIEW 





Fig. 109 



120 



INTERNAL CONNECTIONS OF TYPES IS-2 AND 

IS-3 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

5 to 150 Amps., 25 to 140 Cycles, With and Without 
Transformers 

FRONT VIEW 




Fig. 110 



121 



o 

CO 

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122 



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123 



EXTERNAL CONNECTIONS OF TYPE IS 

THOMSON SINGLE-PHASE 

WATTHOUR METERS 

3 to 75 Amps., 212 to 240 Volts, 25 to 140 Cycles 
Without Transformers 

source 



X 


\ 


1 

I 
1 
1 
t 

i 9 
! <f 


o o 


o 

1 






J 




















L O 


* c/ 















Fig. 115 



124 



EXTERNAL CONNECTIONS OF TYPES IS, IS-2 AND 

IS-3 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Types IS-2 and IS-3 Meters For Use Upon 3-Wire Circuits With 

Form DM-16 Current Transformer 
Type IS Meters Above 75 Amperes For Use Upon 3-Wire Cir- 
cuits With Form DM-16 Current Transformer 

BACK VIEW 



.s o ts r- c <£* 




1 



9 9 



z a a c/ 



Fig. 116 



125 



EXTERNAL CONNECTIONS OF 2-WIRE TYPES 
IS-2 AND IS-3 THOMSON SINGLE-PHASE 
WATTHODR METERS, WHEN USED 
UPON A 3-WIRE CIRCUIT 



kl 



il 



t t Q 



Z o craf 

Fig. 117 
Note. — This method supersedes the method shown on page 125. 



.126 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 5 to 100 Amps., 106 to 120, 212 to 240, 
400 to 480 Volts, 25 Cycles 

AMPERES 







5 






10 






15 






25 








o 


o> 




o 


<U 




i o 


<u 




.2 


0) 


Volts 


u 


••-> 


o 
oJ • 


M 


-u 




»-. 




03 . 


u 


d 


o 




cjW 


rf 


_ 3 


0) 
0)^ 


p3 






(2 




03 


ti 


£ 3 




a 


bo 


rt ^ 


S 


bfl 


.as 


a 


bo 


.ss 


s 


bb 


'*>! 






16f 


s ■ 






Q 






Q 




o 


Q 


106 to 120 


.6 


* 


1.25 


8 


* 


2 


5 


* 


3 


3* 


* 


212 to 240 


1.25 


8 


* 


2.5 


4 


* 


4 


2* 


* 


6 


H 


* 


400 to 480 


2.5 


4 


* 


5 


2 


* 


7.5 


1* 


* 


12.5 


8 


t 



Volts 


AMPERES 


50 75 100 


106 to 120 
212 to 240 
400 to 480 


6 l! 

12.5 8 
25 1 4 


* 7.5 

t 15 
t ! 30 


H 
61 
3* 


* 12.5 
t 25 

t 50 


8 
4 
2 


t 
t 

t 







Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

tDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution =1 kw-hr. 



127 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 
400 to 480 Volts, 25 Cycles 





AMPERES 




150 


200 


300 


Volts 




o 


CD 







0) 




o 


CD 




CD 

«M 




O 
*«3 


u 

CD 

«M 


03 


o 
oS .J 


u 

3M 


4-> 
CO 


O 
ct$.J 




2 


bb 


'^ 


3 


bi 


3^ 


a 


bo 


:d^ 








Q 




CD 


Q 




cd 


Q 


106 to 120 


15 


6? 


t 


25 


4 


t 


40 


2* 


t 


212 to 240 


30 


3| 


t 


50 


2 


t 


75 


11 


t 


400 to 480 


60 


1 2 

1 3 


t 


100 


1 


t 


150 


61 


10 



Volts 



106 to 120 
212 to 240 
400 to 480 



50 
100 
200 



400 



AMPERES 



t 

t 
10 



75 

150 
300 



600 



1* 

6! 
3| 



t 

10 
10 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



128 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 5 to 1500 Amps., 1000 to 1200, 2000 to 
2400 Volts, 25 Cycles 





VOLTS 


Amperes 


1000 to 1200 


2000 to 2400 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


~„ Dial 
£ftf; F ace 
Ratl ° Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 

600 

800 

1000 

1200 

1500 


6 

12.5 

20 

25 

40 

50 

75 

100 

125 

150 

250 

400 

500 

750 

1000 

1250 

1500 

2000 

1 


If 

8 

5 

4 

2| 

2 

If 

1 

8 

6! 

4 

2* 

2 

H 

1 

8 

6! 

5 


* 

t 
t 
t 
t 
t 
t 
t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 


12.5 

25 

40 

50 

75 

100 

150 

200 

250 

300 

500 

750 

1000 

1500 

2000 

2500 

3000 

4000 


8 

4 

2§ 

2 

If 

1 

6| 

5 

4 

3| 

2 

U 

1 

61 

5 

4 

3| 

2i 


I 

1 

t 
t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 

100 

100 



Meter K X 100 X Register Ratio =No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs., except where indicated by * in which case one revolution = 
1 kw-hr. 



129 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 5 to 100 Amps., 106 to 120, 212 to 240, 
400 to 480, 500 to 600 Volts, 40 and 50 Cycles 





AMPERES 




5 


10 


15 


25 


Volts 


u 


.2 

4 


£3 


<dPh 


.2 

'■+3 




u 


.2 


o . 


u 


.2 


o 
(843* 




S 


bi 


T a3<5 


3 


bib 


'rtS 


3 


hi 


T dS 


s 


bo 


'«% 








q 




f2 


p 






s 

* 






Q 


106 to 120 


.4 


25 


* 


.75 


13* 


* 


1.25 


8 


2 


5 


* 


212 to 240 


.75 


13* 


* 


1.5 


6? 


* 


2.5 


4 


* 


4 


2* 


* 


400 to 480 


1.5 


6! 


* 


3 


31 


* 


5 


2 


* 


7.5 


1* 


* 



Volts 


AMPERES 


50 


75 


100 




106 to 120 
212 to 240 
400 to 480 


4 

7.5 
15 


2| 
H 
6! 


* 
* 

t 


5 
10 
20 


2 

1 
5 


* 
* 

t 


7.5 

15 
30 


11 
6f 
31 


* 
t 
t 









Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multipler. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. t except where indicated by * in which case one revolution = 
l^kw-hr. 



130 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 
400 to 480 Volts, 40 and 50 Cycles 



1 


AMPERES 




150 


200 




300 




Volts 


i-i. 

CD 


.2 


o 
S 


Meter 
K 

Reg. Ratio 

Dial Face 
Mult. 


u 

tSM 

2 


.2 
ta 
PS 

ba 

<u 


CD 

o . 
c3 +» 

s 


106 to 120 
212 to 240 
400 to 480 


10 
20 
40 


1 

5 

2h 


* 

t 
t 


15 6| , t 
30 3i ; t 

60 U t 


25 

50 

100 


4 
2 

1 


:: 



Volts 


AMPERES 


400 


600 




106 to 120 
212 to 240 
400 to 480 


! 30 

60 

125 


U 

8 


t 
t 
10 


50 2 1 t 

ioo it 

200 i 5 J 10 







Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. t except where indicated by * in which case one revolution =1 kw-hr. 



131 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 5 to 1500 Amps., 1000 to 1200, 2000 to 
2400 Volts, 40 and 50 Cycles 





VOLTS 


Amperes 


1000/1300 


2000/2400 




Meter K 


Reg. Ratio 


Dial Face 
Mult. 


Meter K 


Reg. Ratio 


Dial Face 
Mult. 


5 


4 


2h 


* 


7.5 


li 


* 


10 


7.5 


1* 


* 


15 


6! 


t 


15 


12.5 


8 


t 


25 


4 


t 


20 


15 


6| 


t 


30 


3| 


t 


30 


25 


4 


t 


50 


2 


t 


40 


30 


31 


t 


60 


1! 


t 


50 


40 


2* 


t 


75 


l* 


t 


60 


50 


2 


t 


100 


l 


t 


80 


60 


1! 


t 


125 


8 


10 


100 


75 


H 


t 


150 


6| 


10 


150 


100 


l 


t 


200 


5 


10 


200 


150 


6| 


10 


300 


3| 


10 


300 


250 


4 


10 


500 


2 


10 


400 


300 


31 


10 


600 


1 1 


10 


600 


500 


2 


10 


1000 


1 


10 


800 


600 


H 


10 


1250 


8 


100 


1000 


750 


U 


10 


1500 


61 


100 


1200 


1000 


1 


10 


2000 


5 


100 


1500 


1250 


8 


100 


2500 


4 


100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs., except where indicated by * in which case one revolution = 
1 kw-hr. 



132 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities S to 100 Amps., 106 to 120, 212 to 240, 400 to 480 
Volts, 60 to 140 Cycles 













AMPERES 














5 


10 


15 


25 


Volts 




o 

cd 


0) 
C<3 +J 


15M 


.2 

Ed 


0) 
o . 

OJ-f-> 

fo3 




o 
+3 
c3 
P4 


cd -+J 

h-3 




.2 

a) 


o 

Oj .J 




3 


bb 


13^ 


£ 


00 


rt^ 


3 


00 


13^ 


s 


bb 


ys 






P4 


Q 






Q 




co 


P 






Q 


106 to 120 


.3 


33± 


* 


16? 


6 


* 


1 


10 


* 


1.5 


6* 


* 


212 to 240 


.6 


16| 


* 


1.25 


8 


* 


2 


5 


* 


3 


3* 


* 


400 to 480 


1.25 


8 * ' 2.5 


4 


* 4 


2| 


* 6 


1* 


* 



Volts 


AMPERES 


50 


75 


100 




106 to 120 
212 to 240 
400 to 480 


3 

6 

12.5 


3* 
l! 
8 


* 

* 

t 


4 2\ 

7.5 11 

15 6| 


* 
* 
t 


6 
12.5 
25 


11 

8 

4 


t 
t 









Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs., except where indicated by * in which case one revolution =1 kw-hr. 



133 



CONSTANTS AND REGISTER DATA FOR TYPES 
IS, IS-2 AND IS-3 THOMSON SINGLE- 
PHASE WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 
400 to 480 Volts, 60 to 140 Cycles 





AMPERES 


Volts 


150 


200 


300 






















o 


<D 




o 


CD 




o 


O) 








O . 




+3 






+i 






0) 


05 


■ ctS+j 


<u 


nj 


Oj -fj 


<u 


oj 


oj +> 




tSM 


ri 


^3 


"8M 


P< 


h-a 


"8M 


ti 


fc-a 




a 


bi 


"cij^ 


£ 


bb 


13^ 


^ 


bb 


*c3<< 






Pi 


p 




P4 


p 






3 


106 to 120 


7.5 


1* 


* 


12.5 


8 


t 


20 


5 


t 


212 to 240 


15 


6! 


t 


25 


4 


t 


40 


2i 


t 


400 to 480 


30 


3| 


t 


50 


2 


t 


75 


ll 


t 



Volts 


AMPERES 


400 


600 




106 to 120 
212 to 240 
400 to 480 


25 

50 

100 


4 
2 

1 


t 

t 
t 


40 

75 

150 


2\ 
If 
61 


t 
t 
10 









Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs., except where indicated by * in which case one revolution =1 kw-hr. 



134 



CONSTANTS AND REGISTER DATA FOR TYPES IS, 

IS-2 AND IS-3 THOMSON SINGLE-PHASE 

WATTHOUR METERS 

Capacities 5 to 1500 Amps., 1000 to 1200, 2000 to 2400 
Volts, 60 to 140 Cycles 









VOLTS 










1000 to 1200 


2000 to 2400 


Amperes 
















Meter 


Reg. 


Dial Face 


Meter 


Reg. 


Dial Face 




K 


Ratio 


Mult. 


K 


Ratio 


Mult. 


5 


3 


3| 


* 


6 


1! 


* 


10 


6 


1! 


* 


12.5 


8 


* 


15 


10 


1 


* 


20 


5 


t 


20 


12.5 


8 


t 


25 


4 


t 


30 


20 


5 


t 


40 


2| 


t 


40 


25 


4 


t 


50 


2 


t 


50 


30 


3| 


t 


60 


H 


t 


60 


40 


2§ 


t 


75 


H 


t 


80 


50 


2 


t 


100 


1 


t 


100 


60 


l! 


t 


125 


8 


10 


150 


75 


If 


t 


150 


61 


10 


200 


125 


8 


10 


250 


4 


10 


300 


2C0 


5 


10 


400 


2| 


10 


400 


250 


4 


10 


500 


2 


10 


600 


400 


2h 


10 


750 


H 


10 


800 


500 


2 


10 


1000 


l 


10 


1000 


600 


If 


10 


1250 


8 


100 


1200 


750 


11 


10 


1500 


6f 


100 


1500 


1000 


1 


10 


2000 


5 


100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs., except where indicated by * in which case one revolution =1 kw-hr. 



135 



TYPE D-3 THOMSON POLYPHASE 
WATTHOUR METER 




Fig. 118 



136 



INTERIOR VIEW OF TYPE D-3 THOMSON 
POLYPHASE WATTHOUR METER 




Fig. 119 



137 



DIMENSIONS OF TYPE D-3 THOMSON POLY- 
PHASE WATTHOUR METERS 

3 to 75 Amps., 25 to 140 Cycles, With and Without 
Transformers 










/8v— 


,t 

-„, ft* 

3 *l* 


( ) 


<§> g" 


S3 p 



-£e 









* 






Fig. 120 



Note — The domed cover such as shown above was not embodied in the 
earlier D-3 meters. 



138 



DIMENSIONS OF TYPE D-3 THOMSON POLY- 
PHASE WATTHOUR METERS 

100 and ISO Amps., 25 to 140 Cycles, Without 
Transformers 






E» i <>l PS 



jfc 



a 



3j m 



-4 



■» ga ^ 



50 



3^^^ 



Sag 



9 



' > 



*W/r-G Z e>rws& 



*-r 






J^z: 



— 1ft I n: i - r~1 » 



3 *V7r-& 2 or 5 ry?ose 



Fig. 121 



Note — The domed cover such as shown above was not embodied in the 
earlier D-3 meters. 



139 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

3 to~150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 
Volts, 25 to 140 Cycles, 3-Wire 2- and 3-Phase and 
Monocyclic Circuits, Without Transformers 

FRONT VIEW 
SouroG 









(h 








1 


> 

1 








a 












k 


> 


-^ 


i 








A 





























lO0cJ 



Fig. 122 



Note. — On 3-wire 2-phase circuits, wire "A" should be the common 
return, on monocyclic circuits wire " A " must be the teaser wire. 



140 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 150 Amps., Not Exceeding 1150 Volts, 25 to 140 Cycles, 

3-Wire 2- and 3-Phase and Monocyclic Circuits 

With Current Transformers 

FRONT VIEW 



Jll. 



ra 



load 



o 



&- 



-4 



Fig. 123 



Note. — On 3-wire 2-phase circuits, wire "A" should be the common 
return, on monocyclic circuits wire "A" must be the teaser wire. 



141 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 1150 Volts, 25 to 140 Cycles, 3- Wire 2- and 3-Phase 

and Monocyclic Circuits, With Current and Potential 

Transformers 



Source 



a 






_£l 



03 



o 



^ 



-<& 



V— 



Loaef 



Fig. 124 



< Note. — On 3-wire 2-phase circuits, wire " A " should be the common 
return, on monocyclic circuits wire "A" must be the teaser wire. 



142 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

3 to 150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 

Volts, 25 to 140 Cycles, 4- Wire 2-Phase Circuits, Without 

Transformers 



FRONT VIEW 



Source 




Fig. 125 



143 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above ISO Amps., Not Exceeding 1150 Volts, 25 to 140 Cycles, 
4- Wire 2-Phase Circuits, With Current Transformers 

FRONT VIEW 



M. 



( I 



o 



4r 



-4 



Fig. 126 



144 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 1150 Volts, 25 to 140 Cycles, 4- Wire 2-Phase Circuits, 
With Current and Potential Transformers 



FRONT VIEW 



Source 



a 



pr 



Looc/ 



S — -r 

PT 



M- 



CZZ) 



□ 



i. 



Fig. 127 



145 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

3 to 75 Amps., 200 to 220 A 115 to 125 Y, 400 to 440 A 230 to 
250 Y Volts, 25 to 140 Cycles, 4- Wire 3-Phase 
Circuits Without Transformers 



FRONT VIEW 



Source 






CD 



&r- 



4> 



/Veufr-<7/ 



LO&4 



Fig. 128 



146 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 75 Amps., Not Exceeding 1150 Volts, 25 to 140 Cycles, 
4- Wire 3-Phase Circuits, With Current Transformers 

FRONT VIEW 

Source 



M. 



1 



a 



& 4, 



Load 



Fig. 129 



147 



EXTERNAL CONNECTIONS OF TYPE D-3 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 1150 Volts, 25 to 140 Cycles, 4- Wire 3-Phase Circuits, 
With Current and Potential Transformers 



Source 



FRONT VIEW 



m: 



M. 



o 



£oo& 



Fig. 130 



148 



INTERNAL CONNECTIONS OF TYPES D-3 AND 
D-4 THOMSON POLYPHASE WATTHOUR 
METERS 

3 to 150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 
Volts, 25 to 140 Cycles, All Circuits Except 4- Wire 
3-Phase, Without Transformers 

BACK VIEW 



fyoeO-3 




6 o-l 7i/peO-3 



Fig. 131 

Note. — 4 wire 2-phase circuits as shown. For 2- and 3-phase monocyclic 
circuits binding post B is omitted and wire should be connected on A. 



149 



INTERNAL CONNECTIONS OF TYPES D-3 AND 

D-4 THOMSON POLYPHASE WATTHOUR 

METERS 

Above 1150 Volts, 25 to 140 Cycles, With Current or Potential 
Transformers or Both, All Circuits Except 4- Wire 3-Phase 

BACK VIEW 




Fig. 132 

Note. — The lead marked "A" will be soldered to the tap giving the best 
results in the test. 



150 



INTERNAL CONNECTIONS OF TYPES D-3 AND 

D-4 POLYPHASE THOMSON WATTHOUR 

METERS 

3 to 75 Amps., 200 to 220 A 115 to 125 Y, 400 to 440 A 230 to 

250 Y Volts, 25 to 140 'Cycles, 4- Wire 3-Phase Circuits 

Without Transformers 

BACK VIEW 



7ype£>3 




^ rc/peO-3 



Fig. 133 

Note — The lead marked "A" will be soldered to that tap which gives the 
best results in the test. 



151 



INTERNAL CONNECTIONS OF TYPES D-3 AND 

D-4 POLYPHASE THOMSON WATTHOUR 

METERS 

Above 1150 Voits, 25 to 140 Cycles, With Current or Potential 

Transformers or Both, 4- Wire 3-Phase Circuits 

BACK VIEW 




Tt/peD-3 



'sm 




Fig. 134 

Note. — The lead marked "A" will be soldered to that tap which gives 
the best results in the test. 



152 



INTERNAL CONNECTIONS OF TYPES D-3, D-4, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

3 to 75 Amps., 200 to 220 A, 115 to 125Y, 400 to 440 A, 230 to 

250Y Volts, 25 to 140 Cycles, 4-Wire 3-Phase Circuits. 

With and Without Transformers 

BACK VIEW 




Fig. 135 

Note. — The above diagram shows later method of winding 4-wire 3-phase 
current coils. Potential connections of meters so wound correspond to con- 
nections as shown on page 151. 



153 



TYPE D-4 POLYPHASE WATTHOUR METER 




Fig. 136 



154 



INTERIOR VIEW OF TYPE D-4 POLYPHASE 
WATTHOUR METER 




Fig. 137 



155 



DIMENSIONS OF TYPE D-4 THOMSON POLY- 
PHASE WATTHOUR METERS 

3 to 75 Amps., 25 to 140 Cycles, With and Without 
Transformers 




W/+/7 7t-crr?s 
A// C/f-cL/s+s &xcejo+ 4~tv3A/> 






A. 






A: 



> 









W/++9 7F-orts 



Fig. 138 



Note — The domed cover such as shown above was not embodied in the 
earlier D-4 meters. 



156 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

\ to 75 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 

Volts, 25 to 140 Cycles, 3-Wire 2- and 3-Phase and 

Monocyclic Circuits, Without Transformers 

FRONT VIEW 




£o<ycf 



Fig. 139 



Note. — On 3 -wire 2- phase circuits, wire "A" should be the common 
return, on monocyclic circuits wire "A" must be the teaser wire. 



157 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 75 Amps., Not Exceeding 1150 Volts, 25 to 140 Cycles 
3-Wire 2- and 3-Phase and Monocyclic Circuits, 
With Current Transformers 



FRONT VIEW 



So t^rc& 




JLoocf 



Fig. 140 



Note. — On 3-wire 2-phase circuits, wire "A" should be the commoi 
return, on monocyclic circuits wire "A" must be the teaser wire. 



158 



JXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

\bove 1150 Volts, 25 to 140 Cycles, 3- Wire 2- and 3-Phase and 

Monocyclic Circuits, With Current and Potential 

Transformers 

FRONT VIEW 

dource 




Load 



Fig. 141 



Note. — On 3- wire 2-phase circuits, wire "A" should be the common 
iturn, on monocyclic circuits wire "A" must be the teaser wire. 



159 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

3 to 75 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 
Volts, 25 to 140 Cycles, 4- Wire 2-Phase Circuits, 
Without Transformers 

FRONT VIEW 



Source 




L octet 



Fig. 142 



160 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 75 Amps., Not Exceeding 1150 Volts, 25 to 140 Cycles, 
4- Wire 2-Phase Circuits, With Current Transformers 

FRONT VIEW 



So uf r- c < 




Fig. 143 



161 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 1150 Volts, 25 to 140 Cycles, 4- Wire 2-Phase Circuits, 
With Current and Potential Transformers 



Source 



coaa 



FRONT VIEW 




Fig. 144 



162 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

3 to 75 Amps., 200 to 220 A 115 to 125 Y, 400 to 440 A 230 to 

250 Y Volts, 25 to 140 Cycles, 4- Wire 3-Phase Circuits, 

Without Transformers 

FRONT VIEW 



s o c* r~c e 




£ a a c/ 



Fig. 145 



163 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 75 Amps., Not Exceeding 1150 Volts, 25 to 140 Cycles, 
4- Wire 3-Phase Circuits, With Current Transformers 

FRONT VIEW 

S — » c/ r-c _» 



























/A\ 






, 1 


1 I 

o 


— | 


( 














c 


ex 










T 






/ 


k 




4 


/ \ 


h 










ct 












• 







/. o o c/ 



Fig. 146 



164 



EXTERNAL CONNECTIONS OF TYPE D-4 THOM- 
SON POLYPHASE WATTHOUR METERS 

Above 1150 Volts, 25 to 140 Cycles, 4- Wire 3-Phase Circuits, 
With Current and Potential Transformers 

Source 




Load 



Fig. 147 



165 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 3 to 100 Amps., 106 to 120, 212 to 240, 400 to 480, 
500 to 600 Volts, 25 Cycles 





AMPERES 




3 


5 


10 


15 






o 


0) 




o 


<u 




o 


<D 




o 


<L> 


Volts 








u 


3 
g 






"3 


3 


u 




O 




3 


bo 


:d^ 


3 


bo 


^^ 


3 


bit 


^£ 


3 


bo 


32 








Q 




tf 


Q 




0) 


p 




f* 


Q 


106 to 120 


l 


100 


t 


1.5 


661 


t 


3 


33* 


t 


5 


20 


t 


212 to 240 


2 


50 


t 


3 


33! 


t 


6 


16! 


t 


10 


10 


t 


400 to 480 


4 


25 


t 


6 


161 


t 


12.5 


80 


10 


20 


50 


10 


500 to 600 


5 


20 


t 


7.5 


13| 


t 


15 


66! 


10 


25 


40 


10 













AMPERES 




Volts 














25 


50 


75 


100 


106 to 120 


7.5 


13* 


t 


15 


66f 


10 


20 


50 


10 


30 


33! 


10 


212 to 240 


15 


66f 


10 


30 


33! 


10 


40 


25 


10 


60 


16! 


10 


400 to 480 


30 


33 i 


10 


60 


16! 


10 


75 


13! 


10 


125 


80 


100 


500 to 600 


40 


25 


10 


75 


m 


10 


100 


10 


10 


150 


66| 


100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



166 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 400 
to 480, 500 to 600 Volts, 25 Cycles 






' AMPERES 


Volts 


400 


600 


Meter Reg. 1 £ ial 

K Ratio Face 

Mult. 


Meter Reg. i Dial 

K Ratio Face 

Mult. 


106 to 120 
212 to 240 
400 to 480 
500 to 600 


125 80 100 
250 40 100 
500 20 100 

600 16! | 100 


200 50 100 

400 25 100 

750 13£ 100 

1000 10 100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



167 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 5 to 800 Amps., 1000 to 1200, 2000 to 2400 Volts, 
25 Cycles 





VOLTS 


Amperes 


1000 to 1200 


3000 to 2400 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 

600 

800 


15 

30 

50 

60 

100 

125 

200 

250 

300 

400 

600 

1000 

1250 

2000 

2500 


66| 

33± 

20 

16| 

10 

80 

50 

40 . 

33* 

25 

161 

10 

80 

50 

40 


10 

10 

10 

10 

10 

100 

100 

100 

100 

100 

100 

100 

1000 

1000 

1000 


30 

60 

100 

125 

200 

250 

400 

500 

600 

750 

1250 

2000 

2500 

4000 

5000 


33£ 

16| 

10 

80 

50 

40 

25 

20 

16! 

13| 

80 

50 

40 

25 

20 


10 

10 

10 

1C0 

100 

100 

100 

100 

100 

100 

1000 

1000 

1000 

1000 

1000 



Meter KX100 XRegister Ratio = No. of watthours recorded by one 
reyolution of the first pointer. 

t Dial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



168 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 3 to 100 Amps., 106 to 120, 212 to 240, 400 to 480, 
500 to 600 Volts, 40 and 50 Cycles 





AMPERES 




3 


5 


10 


15 






o 


<D 




.2 


<D 




o 


o 




.2 


0) 


Volts 




rt 




u 


o3 


O 


u 




o 

fe 3 




rt 


o 




2 


bb 


"S^ 


£ 


CO 


is 


2 


bo 


rf^ 


2 


be 


:d^ 






rt 


Q 




rt 


Q 




rt 


5 
t 




rt 


Q 


106 to 120 


.6 


166f 


t 


1 


100 


t 


2 


50 


3 


331 


t 


212 to 240 


1.25 


80 


t 


2 


50 


t 


4 


25 


t 


6 


163 


t 


400 to 480 


2.5 


40 


t 


4 


25 


t 


7.5 


131 


t 


12.5 


80 


10 


500 to 600 


3 


33i 


t 


5 


20 


t 


10 


10 


t 


15 


66| 


10 



AMPERES 



Volts 


25 


50 


75 


100 


106 to 120 


5 


20 


t 


10 


10 


t 


12.5 


80 


10 


20 


50 


10 


212 to 240 


10 


10 


t 


20 


50 


10 


25 


40 


10 


40 


?5 


10 


400 to 480 


20 


50 


10 


40 


25 


10 


50 


20 


10 


75 


13f 


10 


500 to 600 


25 


40 


10 


50 


20 


10 


60 


16f 


10 


100 


10 


10 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



169 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 400 
to 480, 500 to 600 Volts, 40 and SO Cycles 





AMPERES 


Volts 


150 


200 


300 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


106 to 120 
212ito 240 
400 to 480 
500 to 600 


25 

50 

100 

125 


40 
20 
10 
80 


10 

10 

10 

100 


40 

75 

150 

200 


25 
13* 
66| 
50 


10 

10 
100 
100 


60 
125 
250 
300 


16| 
80 
40 
33| 


10 
100 
100 
100 





AMPERES 


Volts 


400 


60" 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


106 to 120 
212 to 240 
400 to 480 
500 to 600 


75 

150 
300 
400 


is* 

66 f 
33i 
25 


10 
100 
100 
100 


125 
250 
500 
600 


80 
40 
20 
16| 


100 
100 
100 
100 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



170 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 3 to 800 Amperes, 1000 to 1200, 2000 to 2400 
Volts, 40 and 50 Cycles 





VOLTS 


Amperes 


1000 to 1200 


2000 to 2400 














Meter 


Reg. 


Dial 


Meter 


Reg. j £ ial 
Ratio Face 




K 


Ratio 


Face 


K 








Mult. 




Mult. 


5 


10 


10 


t 


20 


50 


10 


10 


20 


50 


• 10 


40 


25 


10 


15 


30 


33^ 


10 


60 


16f 


10 


20 


40 


25 


10 


75 


13* 10 


30 


60 


16| 


10 


125 


80 100 


40 


75 


131 


10 


150 


66f 100 


60 


125 


80 


100 


250 


40 


100 


80 


150 


661 


100 


300 


33| 


100 


100 


200 


50 


100 


400 


25 


100 


150 


250 


40 


100 


500 


20 


100 


200 


400 


25 


100 


750 


13| 


100 


300 


600 


16f 


100 


1250 


80 


1000 


400 


750 


13| 


100 


1500 


66f 


1000 


600 


1250 


80 


1000 


2500 


40 


1000 


800 


1500 


66| 


1000 


3000 


33i 


1000 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



171 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 3 to 200 Amps., 106 to 120, 212 to 240, 400 to 480, 
500 to 600 Volts, 60 to 140 Cycles 





AMPERES 




3 


5 


10 


15 


Volts 




.2 


0) 




o 


<u 




o 


O 




o 


o 








is 






03 ^ 
fe 3 


u 

■8M 


03 


£* 




c8 






S 


bo 


\i^ 


£ 


bb 


d^ 


2 


bfl 


"ss 


% 


bb 


i^ 






ti 


Q 




P4 


Q 




0) 


Q 




o 

tf 


w 


106 to 120 


.4 


250 


t 


.6 


166* 


1 


1.25 


80 


t 


2 


50 


t 


212 to 240 


.75 


133* 


t 


1.25 


80 


t 


2.5 


40 


1 


4 


25 


t 


400 to 480 


1.5 


66| 


t 


2.5 


40 


t 


5 


20 


7.5 


13* 


t 


500 to 600 


2 


50 


t 


3 


33* 


t 


6 


16| 


t 


10 


10 


t 









AMPERES 






Volts 




























25 




50 


75 




100 




106 to 120 


3 


33* 


t 


6 


16* 


t 


7.5 


13* 


t 


12.5 


80 


10 


212 to 240 


6 


16* 


t 


12.5 


80 


10 


15 


66* 


10 


25 


40 


10 


400 to 480 


12.5 


80 


10 


25 


40 


10 


30 


33* 


10 


50 


20 


10 


500 to 600 1 


15 


66| 


10 


30 


33* 


10 


40 


25 


10 


60 


16| 


10 



Volts 










AMPERES 












150 


200 






106 to 120 
212 to 240 
400 to 480 
500 to 600 


15 
30 
60 
75 


66! 
33* 
16f 
13* 


10 
10 
10 

10 


25 

50 

100 

125 


40 
20 
10 
80 


10 

10 

10 

100 















Meter K X 100 X Register Ratio = No. of watthours recorded by one revo- 
lution of the first pointer. 

t Dial face bears no multiplier. 
In all cases, one revolution of first pointer disregarding dial face^multi- 
plier = 10 kw-hrs. 



172 



CONSTANTS AND REGISTER DATA FOR TYPES 

D-3 AND D-4 THOMSON POLYPHASE 

WATTHOUR METERS 

Capacities 300 to 600 Amps., 106 to 120, 212 to 240, 400 to 480, 
S00 to 600 Volts, 60 to 140 Cycles 





AMPERES 




300 


400 


450 




600 






o 


<o 




o 


CO 




o 


<u 




o 


<u 


Volts 






o 


u 


4-> 


O 

rt .J 

5* 


u 

<L> 

tSM 


4-3 

cd 




u 




o 

fe 3 




2 


bb 


'.i% 


3 


bo 


:ss 


2 


ho 


«£ 


£ 


bo 


«3 








Q 






p 






Q 






Q 


106 to 120 


40 


25 


10 


50 


20 


10 


60 


161 


10 


75 


131 


10 


212 to 240 


75 


13| 


10 (100 


10 


10 


125 80 


100 


150 


66| 100 


400 to 480 


150 


66| 100 200 


50 


100 


250 |40 


100 


300 


33i 100 


500 to 600 


200 


50 100 250 


40 


100 


300 33| 


100 


400 


25 100 



Capacities 5 to 2500 Amps., 1000 to 1200, 2000 to 2400 Volts, 
60 to 140 Cycles 





VOLTS 


Amperes 


10C0 to 1200 


2000 to 2400 


Meter 
K 


Reg. 
Ratio 


Dial - 
• Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 

600 

800 


6 

12.5 

20 

25 

40 

50 

75 
100 
125 
150 
250 
400 
500 
750 
1000 


16| 

80 

50 

40 

25 

20 

13| 

10 

80 

66| 

40 

25 

20 

13| 

10 


t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 

100 

100 

100 

100 


12.5 

25 

40 

50 

75 

100 

150 

200 

250 

300 

500 

750 

1000 

1500 

2000 


80 

40 

25 

20 

13| 

10 

66| 

50 

40 

33i 

20 

13| 

10 

66| 

50 


10 

10 

10 

10 

10 

10 

100 

100 

100 

100 

100 

100 

100 

1000 

1000 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw~hrs. 

173 



TYPE DS-2 THOMSON POLYPHASE 
WATTHOUR METER 




Fig. 148 



174 



INTERIOR VIEW OF TYPE DS-2 THOMSON 
POLYPHASE WATTHOUR METER 




Fig. 149 



175 



TYPE DS-3 THOMSON POLYPHASE 
WATTHOUR METER 




Fig. 150 



176 



TYPE DS-4 THOMSON POLYPHASE 
WATTHOUR METER 




Fig. 151 



177 



INTERIOR VIEW OF TYPE DS-4 THOMSON 
POLYPHASE WATTHOUR METER 




Fig. 152 



178 



TYPE DS-5 THOMSON POLYPHASE 
WATTHOUR METER 




Fig. 153 



179 



DIMENSIONS OF TYPE DS-2 THOMSON POLY- 
PHASE WATTHOUR METERS 

3 to 150 Amps., 25 to 140 Cycles, With and Without 
Transformers 
3 75/?rr?/D 
4 W/re JPfiase Q/~£V/ts 





/3" 

6 — 

'6 



'"—* m 3 '50/7^0 

'ir- H/[* /7//C>rc<y't s ercept 
'4 m^e 3Pjhase 



roJJ 



¥K- 



4 ^ -^" * •i^'* 

''I A/vC for Cw St(j£f Woe for Pot Stud 



^-^r- X-*f ■+"£ 



Fig. 154 



Capacity 


DIMENSIONS IN INCHES 


A 


B 


c 


D 


3-100 amp. 
150 amp. 


f 

1 

2 


1 


If 
1* 


1& 



180 



DIMENSIONS OF TYPE DS-3 THOMSON POLY- 
PHASE WATTHOUR METERS 

3 to 150 Amps., 25 to 140 Cycles, With and Without 
Transformers 

3 75/7/71/2 

T 




A/vtforPot 5t(/J 



\+if±-n- *-*£-<**'& 



Capacity 


DIMENSIONS IN INCHES 


A 


B 


c 


D 


3-100 amp. 
150 amp. 


3 

8 

I 


3 
8 

1 

2 


If 
1& 


1& 



181 



DIMENSIONS OF TYPE DS-4 THOMSON POLY 
PHASE WATTHOUR METERS 

3 to ISO Amps., 25 to 140 Cycles, With and Without 
Transformers 

T 




id ^ 

A/ut for Cur Stud 



H eh 




\. — — s z 



3-/SO/)mp. '#" 

/!// C/rcu/ts except T~ 

4-W/re 3-p/mse — +-* m 

Mut for fofi Stud \* 



,-ffc^ 




Fig. 156 




tfHf-^HlH^ 



Capacity 




DIMENSIONS 


IN INCHES 




A 


B 


C 


D 


E 


F 


3- 50 amp. 

75-100 amp. 

150-200 amp. 


f 


f 
1 


ft 

If 

1* 


1A- 


3 
3 
3| 


2| 

If 
2i 



182 



DIMENSIONS OF TYPE DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

3 to 150 Amps., 25 to 140 Cycles, With and Without Transformers 

3-7SS4S77P 
<4H//re J P/?as3 C/rcu/fsS. 




Fig. 157 



Capacity 




DIMENSIONS 


IN INCHES 






A 


B 


C 


D 


E 


F 


3- 50 amp. 

75-100 amp. 

150-200 amp. 


3 
8 

1 


f 

1 


1& 


« 

i& 


3 
3 
3i 


2* 
1! 
21 



183 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

5 to 150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 
Volts, 25 to 140 Cycles, 3-Wire 2- and 3-Phase and 
Monocyclic Circuits Without Transformers 



BACK VIEW 



Source 



i 



on- 



to 



I I 




A/OY-& 



Or? 3 rV/r-& >e A>*?c7sc 
cr-cts/f-s. yy/r-c j4" 
Sftou/cf &e y-/7e corr?rr?or? 
reY-isr-r? t Or? rr?or?ocyc//c 
C/rct//*s kV//~&J7 rr?£j&-f- 



Fig. 158 
184 



£0£?C/ 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4?AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

Above 150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 
Volts, 3-Wire 2- and 3-Phase and Monocyclic 
Circuits, With Current Transformers 

BACK VIEW 



So free 




. oere? 



SV&7*& - Or? SW9r-& ^j^crs^ c/rczssTte, 

W/n-Jb "^S?o*y/c/ Jbc t*S?<s aar?7rr?or? 



Fig. 159 
185 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

Above 150 Amps, and 650 Volts, 3-Wire 2- and 

3-Phase and Monocyclic Circuits With Current and 

Potential Transformers 

BACK VIEW 



Source 



A 



B 



:rr 



cr. 



O 

-o 



I £*— ■ 



± c&cf 



A/o-f-& Or? 3 W/rG Z £>/7a&e c/rccs/fls 

Mre %' sf>au/cr&e /■*?& co/nrnorr 
r^-fc/rr?; or> rr7or?ocyc//c c/rz:t///<s t 
rV/re /7 rYKssY' £>& +/?e 
tecrser- yr/r-c 



^e 



Fig. 160 
186 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

5 to 150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 

Volts, 4- Wire 2-Phase Circuits, Without 

Transformers 

BACK VIEW 



SocJr-c& 



fo 



i 

-rO 

-J-o 



o*- 



I 



I J 



£0C?& 



Fig. 161 

187 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

Above 150 Amps., 106 to 120, 212 to 240, 400 to 480, 500 to 600 

Volts, 4- Wire 2-Phase Circuits With Current 

Transformers 

BACK VIEW 



Source 



CT 



-fo 



E 



1 



TO 



-l-o 



I 



i 



/.oac/ 



Fig. 162 



188 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

Above 150 Amps., and 650 Volts, 4-Wire 2-Phase 
Circuits, With Current and Potential Transformers 

BACK VIEW 



S o c/rce 




£o at/ 



Fig. 163 
189 



EXTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

5 to 75 Amps., 200 to 220 a 115 to 125 Y, 400 to 440 a 230 to 250 Y 

4- Wire 3-Phase Circuits, Without Transformers 

BACK VIEW 



S Oisr-<ze 



r 



1 



40 Of 

■f— o o-r 

■to Or 



I J 



JL 0€*C/ 



Fig. 164 

190 



EXTERNAL CONNECTIONS OF TYPES DS-4 AND 

DS-5* THOMSON POLYPHASE 

WATTHOUR METERS 

Above 75 Amps., 200 to 220 a 115 to 125 Y, 400 to 440 a 230 to 

250 Y, 4- Wire 3-Phase Circuits, 

With Current Transformers 



BACK VIEW 



Sour-c g 




Fig. 165 

'Also Types DS-2 and DS-3 with 3 current elements. 



191 



EXTERNAL CONNECTIONS OF TYPES DS-4 AND 

DS-5* THOMSON POLYPHASE 

WATTHOUR METERS 

Above 75 Amps, and 650 Volts, 4- Wire 3-Phase Circuits 
With Current and Potential Transformers 



BACK VIEW 



Source 



or. 



or. 



cr. 



L-Lo 

— •— o 



oJ- 



r-K) 

4-0 



i_. 



t 

__<>r-^ 



JL 00€f 

Fig. 166 

*Also Types DS-2 and DS-3 with 3 current elements. 
192 



WO 



INTERNAL CONNECTIONS OF TYPES DS-2, DS-3, 

DS-4 AND DS-5 THOMSON POLYPHASE 

WATTHOUR METERS 

All Capacities and All Circuits for Types DS-2 and DS-3 Meters 

Including 4- Wire 3-Phase With 2 Current Elements. All 

Circuits for Types DS-4 and DS-5 Meters Except 4- 

Wire 3-Phase, With and Without Transformers 

BACK VIEW 



ffi=* 




/Vo-fe:- T/~>& /sac/ m&r-A-ecf/f' 
resu/t'-s /n ffre tesA 



Fig. 167 



193 



INTERNAL CONNECTIONS OF TYPES DS-4 AND 

DS-5 THOMSON POLYPHASE WATTHOUR 

METERS, ALSO TYPES DS-2 AND DS-3 

POLYPHASE WATTHOUR METERS 

WITH 3 CURRENT ELEMENTS 

3 to 75 Amps., 200 to 220 A 115 to 125Y, 400 to 440 A 230 to 

250Y Volts, 25 to 140 Cycles, 4-Wire 3-Phase Circuits Only 

With and Without Transformers 



j9cr<o/r y/Gvf 



I 




Atefe The /eocf rno/~Ae& 

?/Tef7c?/zr &/is/nc? /he /best 
rest/Ms /h /he /%*s/ 



Note. — Refer to page 153 for diagram showing later method of connect 
ing current coils of Types DS-4 and DS-5 meters. 



194 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 5 to 100 Amps., 106 to 120, 212 to 240, 400 to 480, 
500 to 600 Volts, 25 Cycles 



. 


AMPERES 






5 10 




15 


25 


Volts 




I 4> i 
1 O 1 . 










o 




o 




a; 
©M 

ST 


. o 

bO+3 


3% 




. o 

33 


c3 .5 

3^ 




. o 
tfp4 


3^ 


3 


Reg. 
Ratio 

ial Fa 

Mult. 








p 






P 






p 






P 


106 to 120 


1.5 


6! 


* 


3 


3* 


* 


5 


2 


* 


7.5 


it 


* 


212 to 240 


3 


3* 


* 


6 


1? 


* 


10 


1 


* 


15 


61 


t 


400 to 480 


6 


If 


* 


12.5 


8 


t 


20 


5 


t 


30 


3* 


t 


500 to 600 


7.5 


1* 


* 


15 


6! 


t 


25 


4 


t 


40 


2* 


t 



Volts 



106 to 120 
212 to 240 
400 to 480 
500 to 600 



AMPERES 



50 



15 
30 
60 
75 



75 



20 
40 
75 

100 



100 



30 3i 

60 If 

125 8 

150 6| 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution =1 kw-hr. 



195 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities ISO to 600 Amps., 106 to 120, 212 to 240, 400 to 
480, 500 to 600 Volts, 25 Cycles 





AMPERES 




150 


200 


300 


Volts 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


106 to 120 
212 to 240 
400 to 480 
500 to 600 


40 

75 

150 

200 


2| 
U 
6| 
5 


t 
t 

10 
10 


60 
125 
250 
300 


1 2 

1 3 

8 
4 
3§ 


t 

10 
10 
10 


100 
200 
400 
500 


1 
5 
2h 
2 


t 

10 
10 
10 





AMPERES 


Volts 


400 


600 
















Meter 


Reg. 


Dial 


Meter 


Reg. 


Dial 




K 


Ratio 


Face 
Mult. 


K 


Ratio 


Face 
Mult. 


106 to 120 


125 


8 


10 


200 


5 


10 


212 to 240 


250 


4 


10 


400 


2h 


10 


400 to 480 


5C0 


2 


10 


750 


H 


10 


500 to 600 


600 


1! 


10 


1000 


1 


10 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



196 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 5 to 800 Amps., 1000 to 1200, 2000 to 2400 Volts, 
25 Cycles 





VOLTS 




1000 to 1200 


2000 to 2400 


Amperes 


Meter 
K 


Reg. 

Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Ratio 
Reg. 


Dial 
Face 
Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 

600 

800 


15 

30 

50 

60 

100 

125 

200 

250 

300 

400 

600 

1000 

1250 

2000 

2500 


61 
3£ 
2 

U 

1 

8 

5 

4 

3| 

2| 

1! 

l 

8 

5 

4 


t 
t 

1 

t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 


30 

60 

100 

125 

200 

250 

400 

500 

600 

750 

1250 

2000 

2500 

4000 

5000 


3| 

H 

1 

8 

5 

4 

2i 

2 

i! 

If 

8 

5 

4 

2h 

2 


t 
t 
t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 

100 

100 



Meter K X100 XRegister Ratio =Xo. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution =1 kw-hr. 



197 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 5 to 100 Amps., 106 to 120, 212 to 240, 400 to 480, 
500 to 660 Volts, 40 and 50 Cycles 





AMPERES 




5 


10 


15 


25 


Volts 




.2 


o» 




.2 


V 




.2 


03 




.2 








rt 
rf 












p2 


^3 




ri 
« 






a 


bb 


3^ 


s 


bb 


3^ 


S 


bb 


3^ 


a 


bb 


W 






10 


Q 
* 




5 


Q 




© 


Q 
* 




33 
1* 


Q 


106 to 120 


l 


2 


* 


3 


3* 


5 


2 


* 


212 to 240 


2 


5 


* 


4 


2* 


* 


6 


1! 


* 


10 


1 


* 


400 to 480 


4 


2* 


* 


7.5 


H 


* 


12.5 


8 


J 


20 


5 


t 


500 to 600 


5 


2 


* 


10 


1 


* 


15 


61 


20 


4 


t 



Volts 


AMPERES 


50 


75 


100 




106 to 120 
212 to 240 
400 to 480 
500 to 600 


10 
20 
40 
50 


1 
5 

2 


* 
t 
t 
t 


10 
25 
50 
60 


1 
4 
2 
l! 


* 
t 
t 

t 


20 

40 

75 

100 


5 

2* 

If 

1 













Meter KX 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution =1 kw-hr. 



198 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 150 to 600 Amps., 106 to 120, 212 to 240, 400 to 480, 
500 to 600 Volts, 40 and 50 Cycles 





AMPERES 


Volts 


150 


200 300 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


.Dial 
IFace 
Mult. 


106 to 120 
212 to 240 
400 to 480 
500 to 600 


25 

50 

100 

125 


4 
2 
1 

8 


t 

t 

t 

10 


40 

75 

150 

200 


2* 
11 

6! 
5 


t 
t 

10 
10 


60 
125 
250 
300 


H 
8 
4 
3| 


t 

10 
10 
10 



Volts 


AMPERES 


400 


600 




106 to 120 
212 to 240 
400 to 480 
500 to 600 


75 
150 
300 
400 


U 
B| 
3| 

2h 


10 
10 


125 
250 
500 

600 


8 
4 
2 
If 


10 
10 
10 
10 









Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



199 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 5 to 800 Amps., 1000 to 1200, 2000 to 2400 Volts, 
40 and 50 Cycles 





VOLTS 




1000 to 1200 


2000 to 2400 


Amperes 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 

600 

800 


10 

20 

30 

40 

60 

75 

125 

150 

200 

250 

400 

600 

750 

1250 

1500 


1 

5 

3£ 

2| 

11 

¥ 
6| 
5 

4 

2| 

1! 

H 

8 
6! 


* 

t 
t 
t 
t 
t 

10 
10 
10 
10 
10 
10 
10 
100 
100 


20 

40 

60 

75 

125 

150 

250 

300 

400 

500 

750 

1250 

1500 

2500 

3000 


5 

ft 

J-3 

8 

fit 

4 3 

f 

61 

4 

3| 


t 

f t 

t 

10 

10 

10 

10 

10 

10 

10 

100 

100 

100 

100 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution =1 kw-hr. 



200 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 5 to 200 Amps., 106 to 120, 212 to 240, 400 to 480 
500 to 600 Volts, 60 to 140 Cycles 

















AMPEEES 














5 


10 


15 


25 


50 


Volts 


| 


_c 






.2 cu 




.2 » 




.2 la 




o 


o 







03 


£* 
W 3 














01 




fe 3 




S 


i 


*E 


2 


» !2£ 


^ 


ti 3^ 


S 


ti rt^ 


2 


bn 


sS 






'J 


3 






Q 




*^ 










p 


106 to 120 


.6 


16- 


* 


1.25 


8 


* 


2 


5 * 


3 


31 * 

1| * 


6 


1! 


* 


212 to 240 


1.25 


8 


* 


2.5 


4 


* 


4 


2\ * 


6 


12.5 


8 


t 


400 to 480 


2.5 


4 


* 


5 


2 


* 


7.5 


11 * 


12.5 


8 t 


25 


4 


t 


500 to 600 


3 


31 


* 


6 ' U 


* 


10 


1 * 


15 


6! t 


30 


3| 1 t 



Volt" 








AMPERES 










75 


100 


150 


200 


106 to 120 7.5 H 
212 to 240 15 1 6| 
400 to 480 30 3i 

500 to 600 40 2\ 


* 

\ 

t 


12.5 
25 
50 
60 


8 t 
4 t 
2 t 
1! t 


15 6| t 
30 3} t 
60 If t 
75 If t 


25 

50 

100 

125 


4 
2 

1 
8 


t 

! 

10 





Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

tDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by *in which case one revolution =1 kw-hr. 



201 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 300 to 600 Amps., 106 to 120, 212 to 240, 400 to 
480, 500 to 600 Volts, 60 to 140 Cycles 





AMPERES 




300 


400 


600 


Volts 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


106 to 120 
212 to 240 
400 to 480 
500 to 600 


40 

75 

150 

200 


2| 
11 
61 
5 


t 
t 

10 
10 


50 
100 
200 
250 


2 
1 
5 
4 


t 
t 

10 
10 


75 

150 
300 
400 


If 

6! 
3* 

2* 


t 

10 
10 
10 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution = 1 kw-hr. 



202 



CONSTANTS AND REGISTER DATA FOR TYPES 
DS-2, DS-3, DS-4 AND DS-5 THOMSON POLY- 
PHASE WATTHOUR METERS 

Capacities 5 to 800 Amps., 1000 to 1200, 2000 to 2400 Volts 
60 to 140 Cycles 





VOLTS 




1000 to 1200 


2000 to 2400 


Amperes 


Meter 
K 


Reg. 
Ratio 


Dial 
Pace 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


5 

10 

15 

20 

30 

40 

60 

80 

100 

150 

200 

300 

400 

600 

800 


6 

12.5 

20 

25 

40 

50 

75 
100 
125 
150 
250 
400 
500 
750 
1000 


I 1 

5 

4 
2* 
2 

H 

1 
8 

¥ 

2* 

2 

11 

1 


* 
t 
t 
t 
t 
t 
t 
t 
10 
10 
10 
10 
10 
10 
10 


12.5 

25 

40 

50 

75 

100 

150 

200 

250 

300 

500 

750 

1000 

1500 

2000 


8 
4 

f 

H 

l 

6| 

5 

4 

1* 

U 

1 

6! 
5 


t 

t 

\ 

t 
t 

10 
10 
10 
10 
10 
10 
10 
100 
100 



Meter KX 100 X Register Ratio = No. of watthours recorded by one 
revolution of first pointer. 

t Dial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution =kw-hr. 



203 



TYPE IB THOMSON INDUCTION PORTABLE 
TEST METER 




Fig. 169 



204 



INTERIOR VIEW OF TYPE IB THOMSON 
INDUCTION PORTABLE TEST METER 




Fig. 170 



205 



TYPE IB-2 THOMSON INDUCTION PORTABLE 
TEST METER 




Fig. 171 



206 



INTERIOR VIEW OF TYPE IB-2 THOMSON 
INDUCTION PORTABLE TEST METER 




Fig. 172 



207 



TYPE IB-3 THOMSON INDUCTION PORTABLE 
TEST METER 




Fig. 173 



208 






INTERIOR VIEW OF TYPE IB-3 THOMSON 
INDUCTION PORTABLE TEST METER 




Fig. 174 



209 



TYPE IB-4 THOMSON INDUCTION PORTABLE 
TEST METER 




Fig. 175 



210 



INTERIOR VIEW OF TYPE IB-4 THOMSON 
INDUCTION PORTABLE TEST METER 




Fig. 176 



211 



o 

CO 

O 
Hi 
H 

i 

M 

-co 

Q« 

a? 5 

«?s 

w 

<fg 

pqH 

S3 

frO 

§2 
2h 

S^ 

»& 
O 

o 



CO 



o o 

* 9 

CD <D 

rt 3 

-^ CO 

?! 



o S 

ss 
<< 

oo 




212 



o 

CO 

s 

o 
w 

H 
■>* 

Wed 

3s 

PQCO 
W 



h! 



PQ 

hO 
OH 

wo 

& £ 

< 
w 

H 
X 

w 



>> 

o >, 

<d a 

a* 3 
o o< 

•S a) 

•5 3 

co o 

.P 

0) „ 

o.S 
Pco 



s| 

o 
o o 

O ^H 

I o 

o m 

i o 

O *H 
i-H I 

in i 




213 



INTERNAL CURRENT CONNECTIONS OF TYPES 

IB, IB-2, IB-3 AND IB-4 THOMSON INDUCTION 

PORTABLE TEST METERS 




S 'Amp. fuse fuf 



9_ 
o 




/Jmp. fuse Pfaf 



Q 



s 



r' 




9, 



10 20 



o 



' Amp. fuse />/*? 



Fig. 179 

Note. — Types IB and IB-2 meters made only in capacities of 1, 10 and 
20 amps. 

Fuse plug omitted on Type IB meters. 



214 



INTERNAL POTENTIAL CONNECTIONS OF 

THOMSON PORTABLE INDUCTION 

TEST METERS, TYPES IB, IB-2, 

IB^3 AND IB-4 



7ZrpS 








£/r?p/e frequency. 




/?es/s. if nsat/aa 






Mote:- A'*/// be so/~ 
t e s/ resu/fs /h T&s-fi\ 



Fig. 180 



215 



CONSTANTS FOR TYPES IB, IB-2, IB-3, AND IB-4 

THOMSON INDUCTION PORTABLE TEST 

METERS 

Capacities 1 to 100 Amps., 100 to 120, 200 to 240 Volts 
25 to 140 Cycles 



Volts 


100 to 120 


200 to 240 






40 


60 




40 


60 


Cycles 


25 


and 


and 


25 


and 


and 






50 


above 




50 


above 


Amps. 


Constants 


1 


.1 


.075 


.05 


.2 


.15 . 


.1 


5 


.5 


.375 


.25 


1 


.75 


.5 


10 


1 


.75 


.5 


2 


1.5 


1 


20 


2 


1.5 


1 


4 


3 


2 


40 


4 


3 


2 


8 


6 


4 


50 


5 


3.75 


2.5 


10 


7.5 


5 


100 


10 


7.5 


5 


20 


15 


10 



One revolution of large pointer corresponds to one revolution of disk. 



216 



TYPE C THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 181 



217 



INTERIOR VIEW OF TYPE C THOMSON DIRECT 
CURRENT WATTHOUR METER 




Fig. 182 



218 



TYPE C-6 THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 183 



219 



INTERIOR VIEW OF TYPE C-6 THOMSON DIRECT 
CURRENT WATTHOUR METER 




Fig. 184 



220 



TYPE C-7 THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 185 



221 



INTERIOR VIEW OF TYPE C-7 THOMSON 
DIRECT CURRENT WATTHOUR METER 




Fig. 186 



222 



DIMENSIONS OF TYPES C, C-6 AND C-7 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

Types C and C-6 Watthour Meters, 5 to 50 Amps., 106 to 120, 
212 to 240 Volts 2- Wire, 400 to 500 Volts 3- Wire 

Type C-7 Watthour Meters, 5 to 50 Amps., 500 to 600 Volts 
2-Wire 



dk 




Types C and C-6, 3-Wire 



M. 



kr 






-4 




Types C and C-6, 2- Wire Type C-7, 2-Wire 

Fig. 187 

Note — The domed cover such as shown above was not embodied in the 
Type C meter and in the earlier Type C-6 meter. 



223 



DIMENSIONS OF TYPES C, C-6, C-7 AND CQ THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

Types C and C-6 Watthour Meters, 75 Amps., 106 to 120, 212 to 

240 Volts 2-Wire, 400 to 500 Volts 3-Wire 
Type C-7 Watthour Meters, 75 Amps., 500 to 600 Volts 2-Wire 
Type CQ Watthour Meters, 50 and 75 Amps., 500 to 600 Volts 

2-Wire 




Types C and C-6, 3-Wire 




Types C and C-6, 2-Wire 

Type C-7, 2-Wire 

Type CQ, 2-Wire 

Fig. 188 

Note — The domed cover such as shown above was not embodied in the 
Type C meter and in the earlier Type C-6 meter. 

224 



DIMENSION OF TYPES C, C-6, C-7 AND CQ THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

Types C and C-6 Watthour Meters, 100 and 150 Amps., 106 to 120> 
212 to 240 Volts 2- Wire, 212 to 240, 400 to 500 Volts 3-Wire 

Tvoe C-7 Watthour Meters, 100 and 150 Amps., 500 to 600 Volts 
3 2- Wire 

Type CQ Watthour Meters, 100 Amps., 500 to 600 Volts 2-Wire 



Aa 



: ^ 



r U4 



EDs 






*ig 






I. 



^wn 



'5 Ns> 



k 



I — v 

ei 









Types C and C-6, 3-Wire 

/5\ 



EIDafl 



fo 



s 



^^gg-i- 



-<& 



C27 

Types C and C-6, 2-Wire 

Type C-7, 2-Wire 

Type CQ, 2-Wire 

Fig. 189 

Note — The domed cover such as shown above was not embodied in the 

Type C meter and in the earlier Type C-6 meter. 

225 



DIMENSIONS OF TYPES C, C-6, C-7 AND CQ THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

Types C and C-6 Watthour Meters, 300 Amps., 106 to 120, 212 

to 240 Volts 2-Wire, 212 to 240, 400 to 500 Volts 3- Wire 
Type C-7 Watthour Meters, 300 Amps., 500 to 600 Volts 2-Wire 
Type CQ Watthour Meters, 200 Amps., 500 to 600 Volts 2-Wire 




Types C and C-6, 3-Wire 

J5L 




Types C and C-6, 2-Wire 
Type C-7, 2-Wire 
Type CQ, 2-Wire 
Fig. 190 

Note — The domed cover such as shown above was not embodied in the 
Type C meter and in the earlier Type C-6 meter. 

226 



DIMENSIONS OF TYPES C AND C-6 THOMSON 
DIRECT CURRENT WATTHOUR METERS 

Types C and C-6 Watthour Meters, 600 Amps., 106 to 120* 
212 to 240 Volts 2- Wire 




Fig. 191 
Note — The domed cover such as shown above was not embodied in the 
Type C meter and in the earlier Type C-6 meter. 

DIMENSIONS OF TYPE C-7 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

600 Amps., 500 to 600 Volts 2- Wire 

Amsu 




DIMENSIONS OF TYPE C-7 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

5 to 50 Amps., 500 to 600 Volts 2-Wire 






*S=^ 



=™E5fi — 



As/6 A 







J: 



i« 5T 






yi 



^ 



<9"- 






J 










Ty-jpe c-zjz w/re 
SO srrrp>. 



Fig. 193 



228 



DIMENSIONS OF TYPES C-7 AND CQ 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-7 Watthour Meters, 75 Amps., 500 to 600 Volts 2-Wire 

Type CQ Watthour Meters, 50 and 75 Amps., 106 to 120, 212[to 

240 Volts 2-Wire, 212 to 240 Volts 3-Wire 




Type CQ, 3-Wire 




Type C-7, 2-Wire 

Type CQ, 2-Wire 

Fig. 194 

229 



DIMENSIONS OF TYPES C-7 AND CQ 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-7 Watthour Meters, 100 and 150 Amps., 500 to 600 Volts 

2-Wire 

Type CQ Watthour Meters, 100 Amps., 106 to 120, 212 to 240 

Volts 2-Wire 

212 to 240 Volts 3-Wire 




Type C-7, 2-Wire 
Type CQ, 2-Wire 

Fig. 195 
230 



DIMENSIONS OF TYPE CQ THOMSON DIRECT 
CURRENT WATTHOUR METERS 

400 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2-Wire 



/ /Vo/g 




I*— / 



J¥ 



*M- 



1 <S 



^ 



'sa ar-ro^ 4 



?, 



£tJ* 



-5i- 



^F 



106 to 120, 212 to 240 Volts 




500 to 600 Volts 
Fig. 196 



231 



DIMENSIONS OF TYPES C-7 AND CQ 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-7 Watthour Meters, 300 Amps., 500 to 600 Volts 2-Wire 

Type CQ Watthour Meters, 200 Amps., 106 to 120, 212 to 240 

Volts 2- Wire, 212 to 240 Volts 3- Wire 




Type CQ, 3- Wire 

/5\ 



Type C-7, 2- Wire 

Type CQ, 2- Wire 

Fig. 197 



3 



3 



~*&\ 




232 



EXTERNAL CONNECTIONS OF TYPES C, C-6 

AND C-7 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Types C and C-6 Watthour Meters, 5 to 50 Amps., 106 to 120, 
212 to 240 Volts 2- Wire 
Type C-7 Watthour Meters, 5 to 25 Amps., 500 to 600 Volts 
'* 2- Wire 



Socjrc& 



M. 



4 <h 



JLOoe/ 



Fig. 198 



233 



EXTERNAL CONNECTIONS OF TYPES C, C-6, C-7, 

CR AND CQ THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Types C, C-6 and CR Watthour Meters, 75 to 600 Amps., 106 

to 120, 212 to 240 Volts 2- Wire 
Type C-7 Watthour Meters, 50 to 600 Amps., 500 to 600 Volts 

2-Wire 

Type CQ Watthour Meters, 50 to 400 Amps., 106 to 120, 212 to 

240 Volts 2-Wire 




Fig. 199 



234 



EXTERNAL CONNECTIONS OF TYPES CR 

AND CQ THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type CR Watthour Meters, 75 to 600 Amps., 500 to 600 Volts 
Type CQ Watthour Meters, 50 to 400 Amps., 500 to 600 Volts 

2-Wire 



M. 



<»> <b 



n o. 



tj u 



Looc/ 



Fig. 200 



235 



EXTERNAL CONNECTIONS OF TYPES C AND C-6 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

5 to SO Amps., 212 to 240, 400 to 500 Volts 3-Wire 







Z o er c/ 



Fig. 201 



236 



EXTERNAL CONNECTIONS OF TYPES C, C-6 

AND CQ THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Types C and C-6 Watthour Meters, 75 to 300 Amps., 212 to 240, 

400 to 500 Volts 3-Wire 
Type CO Watthour Meter, 50 to 200 Amps., 212 to 240 Volts 
y * 3-Wire 




/-ock* 



Fig. 202 

237 



INTERNAL CONNECTIONS OF TYPE C THOMSON 
DIRECT CURRENT WATTHOUR METERS 

5 to 15 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire, 
400 to 500 Volts 3-Wire 




3- Wire 
Fig. 204 



A — Outer Section of Coil. 
B — Inner Section of Coil. 
C — Starting Coil. 



238 



INTERNAL CONNECTIONS OF TYPE C THOMSON 
DIRECT CURRENT WATTHOUR METERS 

25' to 600 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire 
25 to 50 Amps., 400 to 500 Volts 3-Wire 




Strap 

25 and 50 Amps., 2-Wire 
Fig. 205 




600 Amps., 2-Wire 
Fig. 206 




25 and 50 Amps., 3-Wire 
Fig. 207 




A — Starting Coil. 



75 to 300 Amps., 2-Wire 
Fig. 208 

239 



INTERNAL CONNECTIONS OF TYPE C-6 THOM- 
SON DIRECT CURRENT WATTHOUR 
METERS 

Type C-6 Watthour Meter 5 to 15 Amps., 106 to 120, 212 to 240, 

Volts 2- Wire, 212 to 240, 400 to 500 Volts 

3-Wire 




Fig 209 
106 to 120, 212 to 240 Volts, 2- Wire 




Fig. 210 
212 to 240, 400 to 500 Volts, 3- Wire 

A. — Shunt field coil and resistance combined for 2-wire 106 to 120, 212 to 240 

volts and 3-wire 212 to 240, 400 to 500 volts. 
B. — Inner section of coil. 
C. — Outer section of coil. 



240 



INTERNAL CONNECTIONS OF TYPES C-6 AND 
CR THOMSON DIRECT CURRENT WATT- 
HOUR METERS 

Type C-6 Watthour Meters, 25 to 600 Amps., 106 to 120, 212 

to 240 Volts 
Type CR Watthour Meters, 75 to 600 Amps., 500 to 600 Volts 





1 



Fig. 211 

25 and 50 Amps., 2-Wire 

106 to 120, 212 to 240 Volts 



Fig. 212 

75 to 300 Amps., 106 to 120, 

212 to 240 Volts 




Fig. 213 
600 Amps. 2-Wire, 106 to 120, 212 to 240 Volts 

A. — Shunt field coil and resistance combined for 106 to 120 ,212 to 240 volts. 
A. — Shunt field coil only for 500 to 600 volt resistance in separate box. 



241 



INTERNAL CONNECTIONS OF TYPES C AND C-6 

THOMSON DIRECT CURRENT WATTHOUR 

METERS 

Types C and C-6 Watthour Meters, 25 to 300 Amps., 122 to 240, 
400 to 500 Volts 3-Wire 




Fig. 214 
25 to 50 Amps., 212 to 240, 400 to 500 Volts 




Fig. 215 
75 to 300 Amps., 212 to 240, 400 to 500 Volts 

A. — Shunt field coil and resistance combined for 200-500 1 ' volts. 
The combined shunt and resistance was not employed upon Type C meters, 
the resistance being wound upon a tube and mounted inside of the meter. 



242 



INTERNAL CONNECTIONS OF TYPE C-7 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

5 to 15 Amps., 500 to 600 Volts 2-Wire 




A. — Shunt field coil. 

B. — Inner section of coil. 

C. — Outer section of coil. 



Fig. 216 



243 



INTERNAL CONNECTIONS OF TYPE C-7 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

25 to 600 Amps., 500 to 600 Volts 2-Wire 




Fig. 217 
25 Amps. 




ftes/stancefn 
£xtens/on 



Fig. 218 
50 to 300 Amps. 




Fig. 219 
600 Amps. 

A. — Shunt field coil. 

Note — Type C-7 meters made only for use upon two-wire circuits. 



244 



TYPE C-5 THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 220 



245 



INTERIOR VIEW OF TYPE C-5 THOMSON DIRECT 
CURRENT WATTHOUR METER 




Fig. 221 



246 



DIMENSIONS OF TYPE C-5 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

5 to 50 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire, 
212 to 240, 400 to 500 Volts 3-Wire 




P0# 



id 






\. 72". J 3W/re S-2S/!/77p. 



% 



-J 



/$r 



=\ 



iStt/ct^ *H»-H 



j^-*p* r ,je 



& Stvc/^ 




r-^M 



*32. 1 



•-? Stud 



Ui j^*/ 



^Mns S-25/7mp. 




rw^^g&J^yW 






«/# 






2 ^/z-6? SO/9/77/?. 



•^eStuc/ 

Fig. 222 

247 



DIMENSIONS OF TYPE C-5 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

75 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2- Wire, 200 
to 240, 400 to 500 Volts 3-Wire 




j j^Mpiffl 



^-/f— 



-**"- 



3 Wire 



h 








\ 


c 






c' . 




* 


c 






V 






-er- 


— • 



Fig. 223 



248 



DIMENSIONS OF TYPE C-5 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

100 to 150 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire, 
200 to 240, 400 to 500 Volts 3-Wire 



jsEigi 




2 Wins 



Fig. 224 



Capacity ABC 


D 


E 


F 


100 amps. | 
150 amps. \ 


1 

i 

2 






3 

4* 


31 



249 



DIMENSIONS OF TYPE C-5 THOMSON DIRECT 
CURRENT WATTHOTJR METERS 

300 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2- Wire, 
200 to 240, 400 to 500 Volts 3-Wire 




& 






j**4m 



-3$-* 



-eS 



Fig. 225 



250 



DIMENSIONS OF TYPE C-5 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

600 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire 






ttj&£_ 



ef. 






S 






^ 






rft: - (j, ' i'3 



r ip- 



re 









Fig. 226 



--tf— •- 



^ 



251 



EXTERNAL CONNECTIONS OF TYPE C-5 THOM- 
SON DIRECT CURRENT WATTHOUR 
METERS 

5 to 600 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire 
BACK VIEW 



t-ooct •„ 



-o o- 



&> 4 



Source 



Fig. 227 
5 to 600 Amps., 100 to 120, 200 to 240 Volts, 2-Wire 



A 



t-oocf 



-o o- 

-O O— 



<£> 4 



Source 



Fig. 228 
5 to 600 Amps., 500 to 600 Volts, 2-Wire 



252 



EXTERNAL CONNECTIONS OF TYPE C-5 THOM- 
SON DIRECT CURRENT WATTHOUR 
METERS 

5 to 300 Amps., 200 to 240, 400 to 500 Volts 3-Wire 
BACK VIEW 



,_Z&- 




Fig. 229 
5 to 50 Amps., 200 to 240, 400 to 500 Volts, 
3-Wire 




Fig. 230 
75 to 300 Amps., 200 to 240, 400 to 500 Volts, 
3-Wire 
253 



INTERNAL CONNECTIONS OF TYPE C-5 THOM- 
SON JHRECT CURRENT WATTHOUR METERSg 

5 to 15 Amps M 100 to 120, 200 to 240, 500 to 600 Volts 2- Wire, 
200 to 240, 400 to 500 Volts 3-Wire 




Fig. 231 

5 to 15 Amps., 100 to 120, 

200 to 240, 500 to 600 Volts, 2-Wire 




Fig. 232 
5 to 15 Amps., 200 to 240, 
400 to 500 Volts, 3-Wire 

A. — Starting coil and resistance combined for 100 to 120, 200 to 240 volt 

2-wire and 200 to 240, 400 to 500 volt 3-wire. 
A. — Starting coil only for 500 to 600 volt 2-wire meters, resistance in separate 

box. 
B. — Inner section of coil. 
C. — Outer section of coil. 



254 



INTERNAL CONNECTIONS OF TYPE C-5 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

25 to 600 Amps., 100 to 120, 200 to 240, 500 to 600 Volts 2-Wire, 
200 to 240, 400 to 500 Volts 3-Wire 





Fig. 233 
25 to 300 Amps., 106 to 120, 
200 to 240, 500 to 600 Volts, 
2- Wire 



Fig. 234 

25 to 50 Amps., 200 to 240, 

400 to 500 Volts, 

3-Wire 




Fig. 235 

75 to 300 Amps., 200 to 240, 

400 to 500 Volts, 3-Wire 




Fig. 236 
600 Amps., 100 to 120, 200 to 240, 
500 to 600 Volts, 2-Wire 



A. — Starting coil and resistance combined for 200 to 240 volt 2-wife and 200 to 

240, 400 to 500 volt 3-wire. 
A. — Starting coil only for 251 to 600 volt 2-wire, resistance in separate box. 



255 



TYPE C-9 THOMSON DIRECT CURRENT 
WATTHOTJR METER 




Fig. 237 



256 



INTERIOR VIEW OF TYPE C-9 THOMSON DIRECT 
CURRENT WATTHOUR METER 




Fig. 238 



257 



TYPE CQ-2 THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 239 



258 



INTERIOR VIEW OF TYPE CQ-2 THOMSON 
DIRECT CURRENT WATTHOUR METER _- 




Fig. 240 



259 



DIMENSIONS OF TYPE C-9 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire, 
212 to 240, 400 to 500 Volts 3-Wire 




■fc 



;t 






\^V) 



lit J 



A 






Fig. 241 



260 



DIMENSIONS OF TYPES C-9 AND CQ THOMSON 
DIRECT CURRENT WATTHOUR METERS 

50 to 75 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2-Wire, 
. 212 to 240, 400 to 500 Volts 3-Wire 



]" IfllQl'H' 

1 nQiQi'i d: 







f/fo 









■*« 






2W>r<2 



Fig. 242 



Capacity 


A 


50 amps. 
75 amps. 


23^ in. 
\% in. 



261 



DIMENSIONS OF TYPES C-9 AND CQ-2 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-9 Watthour Meters, 100 to 150 Amps., 106 to 120, 212 

to 240, 500 to 600 Volts 2-Wire, 212 to 240, 400 to 500 Volts 

3-Wire 

Type CQ-2 Watthour Meters, 100 Amps., 106 to 120, 212 to 240, 

500 to 600 Volts 2-Wire, 212 to 240 Volts 3-Wire 




»y>L- 



* 



2 tY/re 



Capacity 


A 


B 


C 


D 


E 


F 


100 amps. 
150 amps. 




H 


2 VZ2 
1M6 


5 V*4 

1% 


3 

3H 


1M 



Fig. 243 
262 



DIMENSIONS OF TYPES C-9 AND CQ-2 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-9 Watthour Meters, 300 Amps., 106 to 120, 212 to 240, 

500 to 600 Volts 2- Wire, 212 to 240, 400 to 500 Volts 3- Wire 

Type CQ-2 Watthour Meters, 200 Amps., 106 to 120, 212 to 240, 

400 to 500 Volts 2- Wire, 212 to 240 Volts 3- Wire 



D 

r 



C k 



$ 






m 



^ 



w 









-sjt'- 



~% 



4- 



%$ 
^ 



^ 



*S 



T 

3 Mhe 



-ft/ 






iQn 



3a: 



s"—4 






#*§# 









^ 




2 /**/-<«? 



Capacity 


A 


B 


c 


D 


200 amps. 
300 amps. 


V2 

% 


y 
y 




1 7 ^2 

1% 



Fig. 244 
263 



DIMENSIONS OF TYPES C-9 AND CQ-2 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-9 Watthour Meters, 600 Amps., 106 to 120, 212 to 240, 

500 to 600 Volts 2- Wire 
Type CQ Watthour Meters, 400 Amps., 106 to 120, 212 to 240, 

500 to 600 Volts 2- Wire 

-34' -±-3 f 



-$? 



41 



K=S 



r^r^F- 






LSIS 



A- ^ 



' 'J 



w 



.... V'f^fA 



"Wj 



J 



V 



^ 




Fig. 245 



Capacity 


A 


B 


C 


D 


400 amps. 
600 amps. 


1 


% 

Vs 


2 


IK 
2 Vie 



264 



EXTERNAL CONNECTIONS OF TYPE C-9 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire 
BACK VIEW 



■O^O- 



Fig. 246 

5 to 25 Amps., 106 to 120, 

212 to 240 Volts 



Fig. 247 
5 to 25 Amps., 500 to 600 Volts 




265 



EXTERNAL 
CQ-2 



CONNECTIONS OF TYPES C-9 AND 
THOMSON DIRECT CURRENT 
WATTHOUR METERS 
Type C-9 Watthour Meters, 50 to 600 Amps., 106 to 120, 212 to 

240, 500 to 600 Volts 2-Wire 

Type CQ-2 Watthour Meters, 50 to 400 Amps., 106 to 120, 212 

to 240, 500 to 600 Volts 2- Wire 

BACK VIEW 














, _ 






! ? * 








\ ) 







Fig. 248 

Type C-9, 50 to 600 Amps., 106 to 120, 

212 to 240 Volts 



O 



Fig. 249 
Type C-9, 50 to 600 Amps. 500 to 600 Volts 
Type CQ-2, 50 to 400 Amps., 106 to 120, 
212 to 240, 500 to 600 Volts 

266 



EXTERNAL CONNECTIONS OF TYPE C-9 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

5 to 25 Amps., 212 to 240, 400 to S00 Volts 3- Wire 
BACK VIEW 



A/eis+r-c/ 



n 



Fig. 250 

5 to 25 Amps., 212 to 240, 

400 to 500 Volts 



267 



EXTERNAL CONNECTIONS OF TYPES C-9 AND 

CQ-2 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

Type C-9 Watthour Meters, 50 to 300 Amps., 212 to 240, 400 

to 500 Volts 3-Wire 
Type CQ-2 Watthour Meters, 50 to 200 Amps., 212 to 240, 500 

to 600 Volts 3-Wire 
BACK VIEW 



u 




A/&ts*-s'cr/ 








1 








\ 






1 1 






















I } 












X. O 


a c/ 



Fig. 251 

Type C-9, 50 to 300 Amps., 212 to 240, 

400 to 500 Volts 



£ 


•Otsr-c 


9 


SVGC/'trry/ 












1 


t 
1 










Aj Lr ■■ j- 


n n 








1 i 


/tes/s. 






1 i\ 




V u 








\ 









Fig. 252 

Type CQ-2, 50 to 200 Amps., 212 to 240, 

500 to 600 Volts 

268 



INTERNAL CONNECTIONS OF TYPE C-9 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire, 
212 to 240, 400 to 500 Volts 3-Wire 




Fig. 253 
5 to 15 Amps., 106 to 120, 212 to 240, 
500 to 600 Volts, 2-Wire 



Fig. 254 

5 to 15 Amps., 212 to 240, 400 to 500 

Volts, 3-Wire 





Fig. 255 

25 Amps., 106 to 120, 212 to 240, 

500 to 600 Volts, 2-Wire 



Fig. 256 

25 Amps., 212 to 240, 400 to 500 

Volts, 3-Wire 



A. — Starting coil and resistance combined for 106 to 120, 212 to 240 volts 2-wire 

and 212 to 240, 400 to 500 volts 3-wire. 
A. — Starting coil only for 500 to 600 volts 2-wire, resistance in separate box. 
B. — Inner section of coil. 
C. — Outer section of coil. 



269 



INTERNAL CONNECTIONS OF TYPE C-9 THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

50 to 600 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire 
50 to 300 Amps., 212 to 240, 400 to 500 Volts 3-Wire 



0-7 





Fig. 257 

600 Amps., 106 to 120, 212 to 240, 

500 to 600 Volts, 2- Wire 



Fig. 258 

50 to 300 Amps., 212 to 240, 

400 to 500 Volts, 3-Wire 




Fig. 259 

50 to 300 Amps., 100 to 800 

Volts, 2-Wire 

A. — Starting coil and resistance combined for 106 to 120, 212 to 240 volt 2- wire 

and 212 to 240, 400 to 500 volt 3-wire. 
A. — Starting coil only for 500 to 600 volt 2- wire, resistance in separate box. 



270 



EXTERNAL CONNECTIONS OF TYPE CP THOM- 
SON DIRECT CURRENT PREPAYMENT WATT- 
HOUR METER WITH FORM 3 PRE- 
PAYMENT ATTACHMENT 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire 




Fig. 260 



271 



EXTERNAL CONNECTIONS OF TYPE CP THOM- 
SON DIRECT CURRENT PREPAYMENT WATT- 
HOUR METER WITH FORM 3 PRE- 
PAYMENT ATTACHMENT 

S to 25 Amps., 212 to 240 Volts 3- Wire 




2. o act 



Fig. 261 



272 



INTERNAL CONNECTIONS OF TYPE CP THOM- 
SON DIRECT CURRENT PREPAYMENT WATT- 
HOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 212 to 240 
Volts 3-Wire 




. C — Outer Section of Coil. 
Coil and Resistance Combined. 



3-Wire 
Fig. 263 

B — Inner Section of Coil. 

273 



A — Shunt Field 



TYPE CP-2 THOMSON DIRECT CURRENT 
PREPAYMENT WATTHOUR METER 




Fig. 264 



274 



INTERIOR VIEW OF TYPE CP-2 THOMSON 

DIRECT CURRENT PREPAYMENT 

WATTHOUR METER 




Fig. 265 



275 



DIMENSIONS OF TYPE CP-2 THOMSON DIRECT 

CURRENT PREPAYMENT WATTHOUR 

METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 212 to 
240 Volts 3-Wire 




£//o/<s. 




2-Wire 



Fig. 266 



276 



EXTERNAL CONNECTIONS OF TYPE CP-2 THOM- 
SON DIRECT CURRENT PREPAYMENT 
WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 212 to 
240 Volts 3-Wire 




3)V/>-e 



Fig. 268 

Internal circuit from A to B and C to D. 

277 



z. o arc/ 



INTERNAL CONNECTIONS OF TYPE CP-2 THOM- 
SON DIRECT CURRENT PREPAYMENT 
WATTHOUR METERS 

5 to 25 Amps., 100 to 120, 200 to 240 Volts 2-Wire, and 
200 to 240 Volts 3-Wire 




2-Wire 




3- Wire 
Fig. 269 
-Outer Section of Coil. B — Inner Section of Coil. 
A — Shunt Field Coil and Resistance Combined 

278 



TYPE CP-3 THOMSON DIRECT CURRENT PRE- 
PAYMENT WATTHOUR METER 




Fig 270 



279 



INTERNAL VIEW OF TYPE CP-3 THOMSON 

DIRECT CURRENT PREPAYMENT 

WATTHOUR METER 







Fig. 271 



280 



TYPE CP-4 THOMSON DIRECT CURRENT 
PREPAYMENT WATTHOUR METER 




Fig. 272 



281 



INTERNAL VIEW OF TYPE CP-4 THOMSON 

DIRECT CURRENT PREPAYMENT 

WATTHOUR METER 




Fig. 273 



282 



DIMENSIONS OF TYPES CP-3 AND CP-4 THOM- 
SON DIRECT CURRENT PREPAYMENT 
WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 212 to 
240 Volts 3-Wire 




J> W/re 



($?W^— ^[j 5 * 



2W/r& 



Fig. 274 
283 



"2T 




EXTERNAL CONNECTIONS OF TYPES CP-3 AND 
CP-4 THOMSON DIRECT CURRENT PRE- 
PAYMENT WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 212 to 
240 Volts, 3-Wire 

Source 




Neutral 
3 M//r<<=> 



Fig. 275 

284 



/.OCr</ 



j-o&<y 



INTERNAL CONNECTIONS OF TYPES CP-3 AND 
CP-4 THOMSON DIRECT CURRENT PRE- 
PAYMENT WATTHOUR METERS 

5 to 25 Amps., 106 to 120, 212 to 240 Volts 2-Wire, 212 to 
240 Volts 3-Wire 




2-Wire 




C — Outer Section of Coil. 
Coil and Resistance Combined. 



3-Wire 
Fig. 276 

B — Inner Section of Coil. A — Shunt Field 

285 



TYPE^CR THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 277 



286 



INTERIOR VIEW OF TYPE CR THOMSON DIRECT 
CURRENT WATTHOUR METER 




Fig. 278 



287 



DIMENSIONS OF TYPE CR THOMSON DIRECT 

CURRENT WATTHOUR METERS 
75 to 150 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2-Wire 



/^ //o/e 



~=3& 






yg «Yo/fr 



>■ 



-el 



1. 



i 



Ur-4.1 



^ 



IC 



/#<? -/SO^rrP/O. 



L 




■I- 



-<*— 



7S ^rr?^. 



Fig. 279 
Note:— For external connection diagrams refer to pages 234 and 235. 



288 



DIMENSIONS OF TYPE CR THOMSON DIRECT 
CURRENT WATTHOUR METERS 

300 to 600 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire 

i 




Fig. 280 



289 



CONSTANTS AND REGISTER DATA FOR TYPES C, 

C-6, C-7, CR, CP, CP-2, CP-3 AND CP-4 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

f2-Wire: 5 to 100 Amps., 106 to 120, 212 to 240, 

r^^iHae J 50 ° t0 o0 ° Volts 

v ' apacmes ] 3-Wire: 5 to 100 Amps., 212 to 240, 400 to 440 
[ Volts 





AMPERES 




5 


10 


15 




25 




Volts 


u 
a) 


o 


a 




.2 

CO* 


o 


u 


.2 


0) 

o 
rt .J 




# o 

(4 


o 

C3 .J 




2 


bo 


'£% 


2 


bo 


'2^ 


2 


bo 


:ss 


2 


bo 


32 








Q 




0) 


Q 




P4 


Q 




Pti 


Q 


106 to 120 


.2 


500 


t 


.4 


250 


t 


.6 


166* 


t 


1 


100 


t 


212 to 240 


.4 


250 


t 


.75 


133* 


t 


1.25 


80 


t 


2 


50 


t 


400 to 440 


.75 


133* 


t 


1.5 


66* 


t 


2.5 


40 


t 


4 


25 


t 


500 to 600 


1 


100 


t 


2 


50 


t 


3 


33* 


t 





20 


t 



Volts 


AMPERES 


50 


75 


100 




108 to 120 
212 to 240 
400 to 440 
500 to 600 


2 
4 

7.5 
10 


50 
25 
13* 
10 


t 
t 
t 
t 


3 

6 
12.5 
15 


33* 
16* 
80 
66* 


t 
t 

10 
10 


4 
7.5 

15 
20 


25 
13* 
66* 
50 


t 
t 

10 
10 









Meter K X 100 X Register Ratio =No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



290 



CONSTANTS AND REGISTER DATA FOR TYPES C, 

C-6, C-7 AND CR THOMSON DIRECT 

CURRENT WATTHOUR METERS 

f 2-Wire: 150 to 600 Amps., 106 to 120, 212 to 240, 
500 to 600 Volts 



Capacities 



3-Wire: 150 to 300 Amps., 212 to 240, 400 to 440 
Volts 





AMPERES 






150 


300 




600 




Volts 


u 


£ fe 3 


eter 
K 

Ratio 


o 




.2 

id 


o 

fe 3 




£ 


tc -^ 


2 


M 


-^ 


3 


60 


^S 












Q 






P 


105 to 120 


6 


16! 


t 


12.5 


80 1 10 


25 


40 


10 


212 to 240 


12.5 


80 


10 


25 40 | 10 


50 


20 


10 


400 to 440 


25 


40 


10 


50 


20 10 


100 


10 


10 


500 to 600 


30 


33£ 10 


60 


16| 10 


125 


80 


100 



Meter K X100 XRegister Ratio =Xo. of watthours recorded by one 
revolution of first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



291 



CONSTANTS AND REGISTER DATA FOR TYPES 

C-5 AND C-9 THOMSON DIRECT CURRENT 

WATTHOUR METERS 



Capacities 



(2-Wire: 5 to 150 Amps., 106 to 120, 212 to 240, 
J 500 to 600 Volts 

| 3-Wire: 5 to 150 Amps., 212 to 240, 400 to 440 
[ Volts 





AMPERES 




5 


10 


15 


25 






o 


a> 




o 


<u 




o 


<u 




o 


<D 


Volts 


u 


os 




u 

ISM 


"8 




<L> 




o 
05 .J 


u 


oj 


a 
o5 .j 




3 


bo 


.22 


2 


bo 


'<*£ 


£ 


bo 


ys 


2 


bo 


:-ia 








Q 






Q 




tf 


Q 






Q 


106 to 120 


.2 


500 


t 


.4 


250 


t 


.6 


166* 


t 


1 


100 


t 


212 to 240 


.4 


250 


t 


.75 


133* 


t 


1.25 


80 


t 


2 


50 


t 


400 to 440 


.75 


133* 


t 


1.5 


66* 


t 


2.5 


40 


t 


4 


25 


t 


500 to 600 


1 


100 


t 


2 


50 


t 


3 


33* 


t 


5 


20 


t 



Volts 


AMPERES 


50 


75 


100 


150 


106 to 120 
212 to 240 
400 to 440 
500 to 600 


2 
4 

7.5 
10 


50 
25 
13| 
10 


t 
t 
t 
t 


3 

6 
12.5 
15 


33* 
16* 
80 
66* 


t 
t 

10 
10 


4 
7.5 

15 
20 


25 
13* 
66* 
50 


t 
t 

10 
10 


6 

12.5 

25 

30 


16* 
80 
40 
33* 


t 

10 
10 
10 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



292 



CONSTANTS AND REGISTER DATA FOR TYPES 

C-5 AND C-9 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

f2-Wire: 300 to 600 Amps., 106 to 120, 212 to 
Capacities -j 240, 500 to 600 Volts 

[ 3- Wire: 300 Amps., 212 to 240, 400 to 440 Volts 





AMPERES 




300 


600 


Volts 


u 

o 


Reg. Ratio 
Dial 


Dial 
Face 

Mult. 


2 


o 
a 

be 


•2 ° ** 


106/120 
212/240 
400/440 
500/600 


12.5 
25 
50 
60 


80 
40 
20 
161 


10 
10 
10 
10 


25 

50 

100 

125 


40 
20 
10 
80 


10 

10 

10 

100 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



293 



TYPE CQ THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 281 



294 



INTERIOR VIEW OF TYPE CQ THOMSON DIRECT 
CURRENT WATTHOUR METER 




Fig. 282 



295 



INTERNAL CONNECTIONS OF TYPES CQ AND 

CQ-2 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

50 to 400 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2-Wire 
212 to 240 Volts 3- Wire 



/-ronr v feus. 




3- >Y/7-<3 




^BacA Co/'/ 
^/"ror?* Co// 



T-r 



I 1 Z- w/r-e 

Fig. 283 
Note. — Resistance for Type CQ meters up to 300 volts, 2-wire and 600 
volts 3-wire mounted in a cage upon the meter back. Resistance for Type CQ 
meters above 300 volts 2-wire and 600 volts 3-wire, all Type CQ-2 meters and 
special Type CQ meters mounted in a separate box. 



296 



CONNECTIONS OF ARMATURE FOR TYPES 

CQ AND CQ-2 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

2- and 3-Wire 



Fig. 284 



297 



CONSTANTS AND REGISTER DATA FOR TYPES 

CQ AND CQ-2 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

SO to 400 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire, 
212 to 240 Volts 3-Wire 





AMPERES 




50 


75 


100 


Volts 




.2 
Is 


o 

es+J 


«-. 


.2 


0) 

o 


<u 


•2 


O 




"Em 


ti 


fc-g 


w 


ti 


fe 3 


^M 


tf 


^ 




a 


M 


3^ 


a 


bo 


3^ 


8 


bo 


^ 






0) 


P 






Q 






Q 


106 to 120 


2 


50 


t 


3 


33f 


t 


4 


25 


t 


212 to 240 


4 


25 


t 


6 


16! 


t 


7.5 


13* 


t 


500 to 600 


10 


10 


t 


15 


66f 


10 


20 


50 


10 



Volts 


AMPERES 


200 


400 




106 to 120 
212 to 240 
500 to 600 


7.5 
15 
40 


131 

66f 
25 


t 
10 
10 


15 
30 
75 


60| 
33 * 
13| 


10 
10 
10 









Meter K X Register Ratio X 100 = No. of watthours recorded by one revo- 
lution of the first pointer. 

t Dial face bears no multiplier. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



298 



TYPE CS THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig 285 



299 



DIMENSIONS OF TYPE CS THOMSON DIRECT 

CURRENT WATTHOUR METERS 
50 to 600 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2-Wire 






Fig. 286 

Note. — Originally Type CS meters were designed with the potential studs 
arranged in a horizontal plane as noted above. Later, the potential studs 
were arranged in a vertical plane as noted upon pages 304 to 307 inclusive. 









STUDS 








NUTS 




Amperes 










No. Threads 








No. Used 






A 


B 


C 


D 


per Inch 


E 


F 


G 


per Stud 


H 


50-100 


* 


f 


n 


If 


16 


25 


57 

64 


1 


2 


4i 


150 


5 


* 


1 1 


3i 


13 


1ft 


1ft 


1 


2 


4i 


200 


t 


2 




3* 


13 


1ft 


1ft 


1 


2 


5* 


300 


i 


5 


1 1 


3* 


11 


1ft 


1ft 


1 


2 


5* 


400 


8 


i 


li 


3* 


12 


1« 


2ft 


t 


2 


5* 


600 


H 


l 


11 


Si 


12 


2 


2ft 


l» 


2 


5$ 



300 



DIMENSIONS OF TYPE CS THOMSON DIRECT 
CURRENT WATTHOUR METERS 

800 to 1500 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 
2-Wire 



4-2QT/7J-& 





Dr-t/Z/riQ /n 



fj)r/// 



$ 



Fig. 287 
Note. — Originally Type CS meters were designed with the potential. studs 
arranged in a horizontal plane as noted above. Later, the potential studs 
were arranged in a vertical plane as noted upon pages 304 to 307 inclusive. 





STUDS 


NUTS 


Amperes 


A 


B 


C 


D 


No. Threads 
per Inch 


E 


F 


G 


No. Used 
per Stud 


H 


800 
1200 
1500 


U 

H 


11 

H 
11 


H 
li 

If 


31 
3! 


12 
12 
12 


2tV 
2f 
2f 


2H 
2f 
3A 


1 

f 

1 


2 
3 
3 


5f 

51 

51 



301 



DIMENSIONS OF TYPE CS THOMSON DIRECT 
CURRENT WATTHOUR METERS 

50 to 300 Amps., 212 to 240 Volts 3-Wire 




h^> eg'- 




r— H H<?(- 




Fig. 288 

Note. — Originally Type CS meters were designed with the potential studs 
arranged in a horizontal plane as noted above. Later, the potential studs 
were arranged in a vertical plane as noted upon pages 304 to 307 inclusive. 





STUDS 


NUTS 


Amperes 


A 


B 


c 


D 


No. Threads 
per Inch 


E 


F 


G 


No. Used 
per Stud 


H 


50-75 

100 

150-200 

300 


\ 
\ 

1 
t 


3 

8 

f 

1 
2 
5 
8 


ii 

U 
1* 

u 


H 
If 
3f 
3f 


16 
16 
13 
11 


25 
32 

If 

ix4 
i* 


If 
1* 

1 21 
J- 32 


t 

3 
8 

h 

1 
2 


2 
2 
2 
2 


4i 

51 
51 
51 



302 



DIMENSIONS OF TYPE CS THOMSON DIRECT 
CURRENT WATTHOUR METERS 

400 to 1500 Amps., 212 to 240 Volts 3-Wire 




Fig. 289 



Note. — Originally Type CS meters were designed with the potential studs 
arranged in a horizontal plane as noted below. Later, the potential studs 
were arranged in a vertical plane as noted upon pages 304 to 307 inclusive. 





STUDS 


NUTS 


Amperes 










No. Threads 








No. Used 






A 


B 


C 


D 


per Inch 


E 


F 


G 


per Stud 


H 


400 


1 


3. 


H 


3} 


12 


m 


2& 


f 


2 


5* 


600 


1* 


1 


n 


3i 


12 


2 


2^ 


5 

8 


2 


5* 


800 


H 


It 


H 


3* 


12 


2^ 


2H 


1 


2 


5* 


1200 


If 


H 


u 


4i 


12 


n 


2f 


! 


3 


5* 


1500 


H 


11 


If 


3| 


12 


2| 


Q-3_ 
Ol6 


l 


3 


51 



303 



DIMENSIONS OF TYPE CS THOMSON DIRECT 

CURRENT WATTHOUR METERS 
50 to 600 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2-Wire 



J~& 7»ri/s 




Fig. 290 





STUDS 


NUTS 


Amperes 










No. Threads 








No. Used 






A 


B 


c 


D 


per Inch 


E 


F 


G 


per Stud 


H 


50 


* 


3 
8 


\ 


2* 


16 


H 


H 


ft 


2 


4i 


75-100 


2 


3 




H 


16 


25 
32 


tt 


ft 


2 


4£ 


150 


5 


1 


\l 


2i 


13 


ItV 


1A 


i 

2 


2 


4* 


200 


ft 


1 
2 


U 


2i 


13 


ItV 


l^ 


1 
2 


2 


5* 


300 




5 


T 1 


2i 


11 


ItV 


1 21 
^32 


1 
2 


2 


5* 


400 




2 


■t 1 


3i 


12 


U* 


2^2 


5 

8 


2 


5* 


600 


H 


1 


1 I 

x 4 


3i 


12 


2 


2fk 


I 


2 


5| 



304 



DIMENSIONS OF TYPE CS THOMSON DIRECT 
CURRENT WATTHOUR METERS 

800 to 1500 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 
2-Wire 




Fig. 291 





STUDS NUTS 


Amperes 


A 


B 


c 


jNo. Threads 
D 1 per Inch 


E 


F 


i No. Used 
G J per Stud 


H 


800 
1200 
1500 


H 

1! 
H 


H 

n 
ii 


H 
H 
if 


31 12 

41 12 
3f 12 


2A 

2| 
2f 


2H 
2f 
3* 


i 

3 

4 
1 


2 
3 

3 


5| 
51 

51 



305 



DIMENSIONS OF TYPE CS THOMSON DIRECT 
CURRENT WATTHOUR METERS 

50 to 300 Amps., 212 to 240 Volts 3-Wire 




Fig. 292 





STUDS 


NUTS 


Amperes 










No. Threads 








No. Used 






A 


B 


c 


D 


per Inch 


E 


F 


G 


per Stud 


H 


50 


1 

2 


a. 

8 


\ 


21 


16 


It 


& 


ff 


2 


4* 


75 


1 

2 


t 


1* 


If 


16 


T2" 


H 


1 


2 


4i 


100 


* 


t 


H 


1* 


16 


II 


ft 


ff 


2 


51 


150-200 


ft 


* 


n 


2J 


13 


ItV 


1A 


* 


2 


5* 


300 


1 


I 


u 


2| 


11 


1A 


ifi 


1 


2 


51 



306 






DIMENSIONS OF TYPE CS THOMSON DIRECT 
CURRENT WATTHOUR METERS 

400 to 1500 Amps., 212 to 240 Volts 3-Wire 




r_ 







\-)?-A 







Fig. 293 





STUDS 


NUTS 


Amperes 


A 


B 


C 


D 


No. Threads 
per Inch 


E F 


G 


No. Used 
per Stud 


H 


400 

600 

800 

1200 

1500 


i 
11 

H 
If 
H 


3 

4 
1 

H 

U 
H 


u 
u 
u 
11 

If 


3i 
3£ 
3i 

41 
3! 


12 

12 
12 
12 
12 


-I 13 O 3 

-Lie ^32 

2 3 2 il 
2"T6 2-J2- 

2| 2| 
2| 3* 


5 
I 

5 

8 

1 

1 

1 


2 
2 
2 
3 
3 


51 
51 
51 
5| 

51 



307 



EXTERNAL CONNECTIONS OF TYPE CS 
THOMSON DIRECT CURRENT WATT- 
HOUR METERS 

50 to 1500 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 

2-Wire 



SOWCG 



&JX 



ffes* 
TTTT 



BACK VIEW 



O-o o 



L 



Z W/r& 



Fig. 294 



I octet 



308 



EXTERNAL CONNECTIONS OF TYPE CS THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

50 to 1500 Amps., 212 to 240 Volts 3-Wire 

BACK VIEW 

So u r c & 









c\ n 






► 






ftests 
u u 


1 

i 






! °.i ° 1 








o ! 








i - 

l 
l 

L 1 






fl/cu+r-C7/ 










3 we 


i 



JL O O C/ 



Fig. 295 



309 



INTERNAL CONNECTIONS OF TYPE CS THOM- 
SON DIRECT CURRENT WATTHOUR METERS 

50 to 150 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 2- Wire 
FRONT VIEW 




50 to 75 Amps. 

A — Starting Coil. 




100 to 150 Amps. 
Fig. 296 



310 



INTERNAL CONNECTIONS OF TYPE CS THOM- 
SON DIRECT CURRENT WATTHOUR 
METERS 

50 to 75 Amps., 212 to 240 Volts 3-Wire 
FRONT VIEW 



Sfor-Hnp Co// 




*S+&r-ffng Go/'/ 



Fig. 297 



311 



INTERNAL CONNECTIONS OF TYPE CS THOM- 
SON DIRECT CURRENT WATTHOUR 
METERS 

200 to 1500 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 

2-Wire 

100 to 1500 Amps., 212 to 240 Volts 3-Wire 

FRONT VIEW 




v5 Wfre /I 'Sfarftng Co J/ 



Fig. 298 
312 



ARMATURE CONNECTIONS OF TYPES CS, G-2 

AND G-3 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

50 to 1500 Amps., 2- and 3-Wire 




Top Armature, Top View 




ffedMef/ac 



Bottom Armature, Top View 

Leads wound around on Shaft 

between Two Armatures 

Fig. 299 

313 



CONSTANTS AND REGISTER DATA FOR TYPE CS 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

f 2-Wire: 50 to 600 Amps., 106 to 120, 212 to 240, 
Capacities -| 500 to 600 Volts 

[ 3-Wire: 50 to 300 Amps., 212 to 240 Volts 





AMPERES 




50 


75 


100 


150 






o 


<u 




o 


<u 




o 


<u 




o 


<D 


Volts 


u 


4J 


o 


u 


+3 


o 


u 


-M 


o 


u 


+3 


O 




0) 








rt 
rt 




0) 




03 +J 


Si 

15M 


<3 
PS 


£* 




% 


t£ 


'«% 


% 


b£ 


3-2 


S 


bb 


^ 


S 


bo 


's^ 








Q 




0) 

P4 


Q 




0) 


Q 






Q 


106 to 120 


2 


5 


* 


3 


3* 


* 


4 


2^ 


* 


6 


1' 


* 


212 to 240 


4 


2* 


* 


6 


H 


* 


7.5 


1* 


* 


12.5 


8 


t 


500 to 600 


10 


1 


* 


15 


6! 


t 


20 


5 


t 


30 


3| 


t 



Volts 


AMPERES 


200 


300 


400 


600 


106 to 120 
212 to 240 
500 to 600 


7.5 
15 
40 


1* 

6f 

2h 


* 

t 

t 


12.5 

25 

60 


8 
4 
1 2 

J- 3 


t 
t 
t 


15 
30 
75 


6! 
3| 
If 


t 
t 
t 


25 
50 

125 


4 
2 

8 


t 
t 
10 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. except where indicated by * in which case one revolution = 1 kw-hr. 



314 



CONSTANTS AND REGISTER DATA FOR TYPE CS 

THOMSON DIRECT CURRENT 

WATTHOUR METERS 

f 2- Wire: 800 to 1500 Amps., 106 to 120, 212 to 240, 
Capacities •) 500 to 600 Volts 

[ 3-Wire: 800 to 1500 Amps., 212 to 240 Volts 





AMPERES 




800 


1200 


1500 


Volts 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 
Mult. 


Meter 
K 


Reg. 
Ratio 


Dial 
Face 

Mult. 


Meter 
K 


Reg. 

Ratio 


Dial 
Face 
Mult. 


106 to 120 j 
212 to 240: 
500 to 600 

1 


40 

75 

200 


2| 
5 


t 
t 
10 


60 
125 
300 


1 2 

1 3 

8 

3| 


t 

10 
10 


75 
150 

400 


H 

61 

2h 


t 

10 
10 



Meter K X 100 X Register Ratio = No. of watthours recorded by one 
revolution of first pointer. 

fDial face bears no multiplier. 

In all cases, one revolution of first pointer, disregarding dial face multiplier 
= 10 kw-hrs. 



315 



TYPE G-3 THOMSON DIRECT CURRENT 
WATTHOUR METER 




Fig. 300 



316 



DIMENSIONS OF TYPE G-3 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

2000 to 10,000 Amps., 106 to 120, 212 to 240, 400 to 480, 500 
to 600 Volts 2-Wire 




Drs///h? /n S*r*ctt**rdt 



Fig. 301 



Amperes 


A 

If 

2 
2| 

3i 

4 

4f 


B C 


D E F G 


H J K 


L M X 


O 


Nuts Used 
per Stud 


2000 
3000 
4000 
6000 
8000 
10000 


6 118^ 

7 :18^ 

8 18| 

9 18* 
\\\ 21f 
111 21f 


14f 2H 3| 19A 
14f 2H 3^ 19& 
14| 2H 3| 19& 
14| 2H 3* 19& 
19| 4^ 41 22H 
19| 4& 41 22H 


6^ 11H \\ 
6A HH 2\ 
6^ 11H 2| 

6A HH 3f 

m 14^ 41 
6M 14A 41 


2!3fV 

313f 

3i4i 

4| 
5f 
71 


1 19. 
^ 32 

r 13 

8i 


3 

4 
5 
5 

7 
7 



317 



DIMENSIONS OF TYPE G-2 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

2000 to 10,000 Amps., 106 to 120, 212 to 240, 400 to 480, 500 
to 600 Volts 2-Wire 








3\ 



grto/e 






K- 




Dr////ng /n 5tv/tchboorcf 



Fig. 302 





A 


B 


C 


D 


E 


F 


G 


H 


J 


K 


L 


NUTS 


Amperes 


M 


N 


O 


No. Used 
per Stud 


2000 


If 


6 


184 


14* 


013 

^16 


34 


19* 


6* 


ll*4 


1* 


2f 


3* 






3 


3000 


2 


7 


184 


14* 


24* 


34 


19* 


6^ 


11« 


2* 


3* 


31 






4 


4000 


24 


8 


184 


14* 


2H 


34 


19* 


6& 


11H 


2* 


3* 


4* 






5 


6000 


3i 


9 


184 


14* 


m 


34 


19* 


6& 


lltt 


3* 






4* 


m 


5 


8000 


4 


114 


21| 


19* 


4A 


4* 


22* 


6M 


14* 


4* 






5| 


5tt 


7 


10000 4f 


Hi 


21| 


19* 


4t^ 


4f 22^ 6ff 


14* 


41 






7| 


8* 


7 



318 



DIMENSIONS OF TYPE G-2 THOMSON DIRECT 

CURRENT WATTHOUR METERS 

2000 to 6000 Amps., 212 to 240 Volts 3-Wire 




JZTfireads 



J§-/8 Threads 







6 






I*-/' 



P5 



Uph^ * 



wr 




On///ng in Sw/tchboord 

















Fig. 303 


















D 


E 


F 


G 


H J 




NUTS 


Amperes 


A B 


C 


K L 


M 


N 


O 


P 


No. Used 
per Stud 


2000 
3000 
4000 
6000 


If 6 
2 7 
2| 8 

3i 9 


21f 

21f 
21| 
23 A 


191 

191 
191 
211 


2^ 

2te 

2H 


61 

6! 
6! 
7 


3* 

3? 
3^ 
4| 


22^ 3 
22^ 3 
22£ 3 

24 !2A 


10H H 
10H 21 
10tt 2f 
10A 3f 


2! 

3| 
3i 


3^ 

3f 

4£ 


41 


4H 


3 

4 
4 
5 



319 



DIMENSIONS OF TYPE G-3 THOMSON DIRECT 
CURRENT WATTHOUR METERS 

2000 to 6000 Amps., 212 to 240 Volts 3- Wire 




Fig. 304 



































Nuts 


Amperes 


A 


B 


C 


D 


E 


F 


G 


H 


J 


K 


L 


M 


N 


O 


P 


Used per 
Stud 


2000 


U 


6 


21f 


19f 


2^ 


6* 


3* 


22H 


3 


10H 


1* 


2! 


3^ 






3 


3000 


2 


7 


21f 


19* 


2^ 


6* 


3* 


22^ 


3 


ion 


2* 


3* 


3| 






4 


4000 


24 


8 


21! 


19t 


2^ 


6* 


3 + 


22H 


3 


10H 


21 


3* 


4* 






5 


6000 


3i 


9 


23A 


21f 


2H 


7 


4f 


24| 


2H 


10* 


3| 






4i 


4H 


5 



320 



CONNECTIONS OF TYPES G-2 AND G-3 THOMSON 
DIRECT CURRENT WATTHOUR METERS 

2000 to 10,000 Amps., 106 to 120, 212 to 240, 400 to 480, 500 
to 600 Volts 2-Wire 

Senate V/&w 




Fig. 305 




Socur—ce 



& a 



JVWH 



J9<-*s 



jCo&^J 



Fig. 306 



321 



CONNECTIONS OF TYPES G-2 AND G-3 THOMSON 

DIRECT CURRENT WATTHOUR 

METERS 

2000 to 6000 Amps., 212 to 240 Volts 3-Wire 
FRONT VIEW 




Note. — Load and generator connections are interchangeable, top bus 
always +. Leads of potential circuit always on generator side, the leads of light- 
ning arresters on the load side. If generator is on the right, the leads at th( 
brush bracket must be interchanged. 



322 



CONNECTIONS OF TYPES G-2 AND G-3 THOMSON 

DIRECT CURRENT WATTHOUR 

METERS 

2000 to 6000 Amps., 212 to 240 Volts 3-Wire 
BACK VIEW 




Fig. 308 

Note. — Load and generator connections are interchangeable, top bus 
always-K Leads of potential circuit always on generator side, the leads of light- 
ning arresters on the load side. If generator is on the left, the potential leads 
of the meter must be interchanged. 



323 



CONSTANTS AND REGISTER DATA FOR TYPES 

G-2 AND G-3 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

2000 to 6000 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 
2- Wire and 212 to 240 Volts 3-Wire 





AMPERES 




2000 


3000 


4000 


6000 


Volts 


(h 

CD 


o 


o 


CD 


.2 

CT3 


o 
o 

03+J 
fo 3 




o 


0) 

o 


u 


.2 

o3 






s 


tab 


gs 


S 


bi) 


"d^ 


S 


bo 


.'sis 


E 


bo 


3£ 








Q 






p 






A 




0) 


Q 


106 to 120 


100 


1 


t 


150 


6| 


10 


200 


5 


10 


300 


3* 


10 


212 to 240 


200 


5 


10 


300 


3* 


10 


400 


2* 


10 


600 


If 


10 


500 to 600 


500 


2 


10 


750 


1* 


10 


1000 


1 


10 


1500 


61 


100 



Meter K X100 XRegister Ratio = No. of watthours recorded by one 
revolution of the first pointer, 
f Dial face bears no multiplier. 
In all cases one revolution of first pointer =10 kw-hrs. 



324 



CONSTANTS AND REGISTER DATA FOR TYPES 

G-2 AND G-3 THOMSON DIRECT CURRENT 

WATTHOUR METERS 

8000 to 10,000 Amps., 106 to 120, 212 to 240, 500 to 600 Volts 

2-Wire 





AMPERES 


Volts 


8000 10000 


Meter Pveg. Dial 

K Ratio Face 

Mult. 


Meter 
K 


Reg. Dial 
Ratio F a ce 

Mult. 


106 to 120 
212 to 240 
500 to 600 


400 2| 10 

750 1| 10 

2000 5 100 


500 
1000 
2500 


2 10 
1 10 
4 100 



Meter K X100 XRegister Ratio =Xo. of watthours recorded by one 
revolution of the first pointer. 

In all cases, one revolution of first pointer disregarding dial face multiplier 
= 10 kw-hrs. 



325 



TYPE CB THOMSON DIRECT CURRENT 
PORTABLE TEST METER 




Fig. 309 



326 



INTERIOR VIEW OF TYPE CB THOMSON DIRECT 
CURRENT PORTABLE TEST METER 







J27 



TYPE CB-2 THOMSON DIRECT CURRENT 
PORTABLE TEST METER 




Fig. 311 



328 



INTERIOR VIEW OF TYPE CB-2 THOMSON 

DIRECT CURRENT PORTABLE 

TEST METER 




Fig. 312 



329 



TYPE CB-3 THOMSON DIRECT CURRENT 
PORTABLE TEST METER 




Fig. 313 



330 



INTERIOR VIEW OF TYPE CB-3 THOMSON 

DIRECT CURRENT PORTABLE 

TEST METER 




Fig. 314 



331 



TYPE CB-4 THOMSON DIRECT CURRENT 
PORTABLE TEST METER 




Fig. 315 



332 



INTERIOR VIEW OF TYPE CB-4 THOMSON 

DIRECT CURRENT PORTABLE 

TEST METER 




Fig. 316 



333 




334 



O 

w 



fei 

o 

o 
M 

OS 

CO 

o, 



CO' 

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'W 

I 

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O 

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H 

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w 








335 



rt 
w 

H 



o 

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CO 

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o 
Q 

<5 

«w 

OS 

mm 

Art 

W 
W« 

Ota 
S° 

oh 

go 

&rt 
°S 

& 

rt 
w 



o 
o 

M 




336 



o 

o 
w 

H 

mw 

OH 

w 
OS 
*C 

<H 

en 

COM 

OH 
r „fe 

Opi 

few 
°S 

< 
« 

w 

H 
X 

w 



Oh 

6 
<J 

o 
o 

o 
10 



in 



I 

i 



1 1 1 1 

s § 5 § 




337 



P 
o 

H 
O 

w 

O 

og 

O ^ 

n H 
«H 



wrt 6 

I— I 
H 
O 

w 

to 
o 
o 



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W 



CO 






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338 



g 

H 
O 



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O 

CO 

Hg 
Oco 

°£ 

Oft 

H 
O 

W 

o 
o 

« 

w 

H 
X 
H 



o 

> 

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in 



o 

o 



< 
© 

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339 



g 

o 

H 
O 

w 



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ow 






fa 

oft 

H 
O 

w 
o 






S 

<! 

© 

< 2 




H 

W 



340 



o 

CM 



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a. 

s 
< 




341 



3 

t> 
o 

H 
O 
W 

& * 

A "3 

O ■* 
m m " 

OW § 
WH S 

t s s 

pq H o 

gH S 
*W § 

H m' H . 
°g i 

§*§ 

H 
O 

W 

o 
o 

< 
w 

H 
W 



o 
in 



in 




342 



I INTERNAL CURRENT CONNECTIONS OF TYPE 

CB AND LOW CAPACITY TYPES CB-2, CB-3 

AND CB-4 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

1-2-10-20-40 Amps. 

7&r-m/r7C3/ Z. go <z/, Common. 



r® r6r6 



/O -£0-4Os4rn&. 







r — mmm- 1 



No. 1 — 1st strip wound section, 10 amp. 
No. 2 — 2nd strip wound section, 10 amp. 
No. 3 — 3rd strip wound section, 10 amp. 
No. 4 — 4th strip wound section, 10 amp. 
No. 5 — 1st wire wound section, 1 amp. 
No. 6 — 2nd wire wound section, 1 amp. 

Fig. 326 



Note. — "3" denotes start of a section. 
343 



"F" denotes finish of a section. 



INTERNAL CURRENT CONNECTIONS OF TYPES 

CB-2, CB-3 AND CB-4 THOMSON DIRECT 

CURRENT PORTABLE TEST METERS 

5-10-50-100 Amps. 

%Co/r>mor7 Current 7erm/no/. 




G^_^)rQ 



Fuse P/ug 




<4 Boc/r Co /As 



Fig. 327 

Note— "S" denotes start of a section. ,4 F" denotes finish of a section. 



344 



INTERNAL POTENTIAL CONNECTIONS OF TYPES 

CB, CB-2 AND CB-3 THOMSON DIRECT 

CURRENT PORTABLE TEST METERS 

100 to 120 Volts 







Shuni- 



/?es%f£?ce 3jooots\ /lrfT7afL ' r " 



Fig. 328 

Note — Heating key down — heating position. Heating key up — working 
position. 



345 



INTERNAL POTENTIAL CONNECTIONS OF 

DOUBLE VOLTAGE TYPES CB, CB-2 AND 

CB-3 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

Connections as Shown are for the Lower of Two Voltages 



f?es/sfc>nce 



j-O 



f*€>n<z/<zrn /" v5 vv/<*r/? 







s4r-m oAjr-G 



Fig. 329 

Note. — Heating key down — heating position. Heating key up — working 
position. 



346 



INTERNAL POTENTIAL CONNECTIONS OF 

DOUBLE VOLTAGE TYPES CB, CB-2 AND 

CB-3 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

Connections as Shown are for the Higher of Two Voltages 




Heavy lines show working connections. 
Dash and dot lines show heating connections. 

347 



INTERNAL POTENTIAL CONNECTIONS OF TYPES 

CB, CB-2 AND CB-4 THOMSON DIRECT 

CURRENT PORTABLE TEST METERS 

200 to 250 Volts 



Pena/arrf <Sw/fc/? 







/?&&/& tc7 r> ere 
/r? Cch?& 

Fig. 331 



348 



INTERNAL POTENTIAL CONNECTIONS OF TYPE 

CB-4 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

100 to 120 Volts 
VIEWED FROM FRONT AND TOP 




/r?/err?a/Jfes/s. 








Fig. 332 
349 



INTERNAL POTENTIAL CONNECTIONS OF TYPE 

CB-4 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

200 to 240 Volts 
VIEWED FROM FRONT AND TOP 




movrrfec/ /r? Cape 




INTERNAL POTENTIAL CONNECTIONS OF 

TYPE CB-4 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

100 to 120 and 200 to 240 Volts 
VIEWED FROM FRONT AND TOP 



220 Vo/fAfa# r?&f 



£ 







jEjrter-r7&/ ffes is fence 
r\ in Cage r-\ 



<7ap/?£r 




Fig. 334 



351 



CONSTANT DATA FOR TYPES CB, CB-2, CB-3 AND 

CB-4 THOMSON DIRECT CURRENT 

PORTABLE TEST METERS 

Capacities 1 to 100 Amps., 100 to 120, 200 to 240 Volts 





VOLTS 


Amperes 


100-120 




200-240 




Constants 


1 


.05 






.1 


2 


.1 






.2 


5 


.25 






.5 


10 


.5 






1. 


20 


1. 






2. 


40 


2. 






4. 


50 


2.5 






5. 


100 


5. 






10. 



One revolution of large pointer corresponds to one revolution of the 
meter disk. 



352 



TYPE W THOMSON POLYPHASE MAXIMUM 
WATT DEMAND INDICATOR 




Fig. 335 

INTERIOR VIEW OF TYPE W THOMSON POLY- 
PHASE MAXIMUM WATT DEMAND INDICATOR 




DIMENSIONS OF TYPE W THOMSON POLYPHASE 
MAXIMUM WATT DEMAND INDICATORS 

3 to 25 Amps., 25 to 140 Cycles, With and Without 
Transformers 




DIMENSIONS OF TYPE W THOMSON POLYPHASE 
MAXIMUM WATT DEMAND INDICATORS 

50 to 75 Amps., 25 to 140 Cycles. All Circuits Except 4- Wire 
3-Phase* With and Without Transformers 




+ /£'- 



Fig. 338 

*4 wire 3-phase indicators made self-contained up to 25 amp. only. 



355 



DIMENSIONS OF TYPE W THOMSON POLY- 
PHASE MAXIMUM WATT DEMAND 
INDICATORS 

100 to 150 Amps., 25 to 140 Cycles and Above. All Circuits 

Except 4- Wire 3-Phase* With and 

Without Transformers 







Fig. 339 

*4-wire 3-phase indicators made self-contained up to 25 amperes only. 



356 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

3 to 25 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 25 to 140 

Cycles, 3-Wire, 2 and 3-Phase and Monocyclic Circuits, 

Without Transformers 

FRONT VIEW 









/5\ 




> 


r > 

u 


y 








fi 


1 




/ 




(s 


/ \ 


1 













Fig. 340 

Note. — On 3-wire 2-phase circuits wire "A" should be the common return. 



357 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

50 to 150 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 25 to 

140 Cycles, 3-Wire, 2- and 3-Phase and Monocyclic Circuits, 

Without Transformers 

FRONT VIEW 



Sots' 




Fig. 341 

Note. — On 3-wire 2-phase circuits wire "A" should be the common return. 



358 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

Above 150 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 25 

to 140 Cycles, 3-Wire, 2- and 3-Phase and Monocyclic 

Circuits, With Current Transformers 

FRONT VIEW 




Fig. 342 
Note. — On 3-wire 2-phase circuits wire "A" should be the common~return. 



359 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

Above 650 Volts, 25 to 140 Cycles, 3-Wire, 2- and 3-Phase 

and Monocyclic Circuits, With Current and 

Potential Transformers 



FRONT VIEW 



Sots/~e& 




Fig. 343 

Note. — On 3-wire 2-phase circuits wire "A" should be the common return. 



360 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

3 to 25 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 

25 to to 140 Cycles, 4- Wire, 2-Phase Circuits, 

Without Transformers 

FRONT VIEW 



SOtf/rc & 



M. 




k- 



-4> 



Fig. 344 



361 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

50 to 150 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 

25 to 140 Cycles, 4- Wire, 2-Phase Circuits, 

Without Transformers 

FRONT VIEW 

£ © ts *• C & 



\ 




^ o ca c/ 



Eig. 345 



362 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

Above 150 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 

25 to 140 Cycles, 4-. Wire, 2-Phase Circuits, 

With Current Transformers 



FRONT VIEW 



SO LS /~C & 



M. 




4r 



4 



Fig. 346 



363 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

Above 650 Volts, 25 to 140 Cycles, 4- Wire, 2-Phase Circuits, 
With Current and Potential Transformers 

FRONT VIEW 




^<9 



Fig. 347 



364 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

3 to 25 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 25 to 140 
Cycles, 4-Wire, 3-Phase Circuits, Without Transformers 

FRONT VIEW 



M. 




&- 



-4 



Fig. 348 



365 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

Above 25 Amps., 212 to 240, 400 to 480, 500 to 600 Volts, 

25 to 140 Cycles, 4- Wire, 3-Phase Circuits, 

With Current Transformers 

FRONT VIEW 



J£l 



ffl 




4- 



-<b 



Fig. 349 



366 



EXTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

Above 650 Volts, 25 to 140 Cycles, 4- Wire 3-Phase Circuits, 
With Current and Potential Transformers 

FRONT VIEW 




Fig. 350 



367 



INTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

5 to ISO Amps., 25 to 140 Cycles. All Circuits Except 4- Wire, 

3-Phase, With and Without Transformers 

BACK VIEW 




olCi 




Fig. 351 

Note. — On 50 to 150 amp. potential posts marked " A " are located between 
current posts. |g£ 

Note. — -The lead marked "A" will be soldered to that tap which gives the 
best results in the test. 

368 



INTERNAL CONNECTIONS OF TYPE W THOMSON 

POLYPHASE MAXIMUM WATT DEMAND 

INDICATORS 

5 to 25 Amps., 25 to 140 Cycles, 4-Wire 3-Phase Circuits, 
With and Without Transformers 

BACK VIEW 




Fig. 352 

Note. — The lead marked "A" will be soldered to that tap which gives the 
best results in test. 

369 



INDEX 



Page 

Armatures 48 

Calibrating Voltages 4 

C Watthour Meter .22 

Illustrations 217, 218 

Dimensions 223-227 

Connections, External 233, 234, 236, 237 

Connections, Internal 238, 239, 242 

Constant and Register Data. . . . 291, 292 

C-5 Watthour Meter 23 

Illustrations 245, 246 

Dimensions 247-251 

Connections, External 252, 253 

Connections, Internal, . 254, 255 

Constant and Register Data 292, 293 

C-6 Watthour Meter 23 

Illustrations 219, 220 

Dimensions 223, 227 

Connections, External 233, 234, 236, 237 

Dimensions, Internal 241, 242 

Constant and Register Data 291, 292 

C-7 Watthour Meter 23 

Illustrations 221, 222 

Dimensions 223-226, 228-230, 232 

Connections, External 233, 234 

Connections, Internal. . 243, 244 

Constant and Register Data 291, 292 

C-9 Watthour Meter 23 

Illustrations 256, 257 

Dimensions 260-264 

Connections, External 265-268 

Connections, Internal . 269, 270 

Constant and Register Data 292, 293 

374 



Page 

CQ Watthour Meter 24 

Illustrations 204, 205 

Dimensions 224-226, 229-232, 261 

Connections, External 234, 235, 237 

Connections, Internal 296, 297 

Constant and Register Data 298 

CQ-2 Watthour Meter 24 

Illustrations 258, 259 

Dimensions 262-264 

Connections, External .266, 268 

Connections, Internal 296, 297 

Constant and Register Data 298 

CR Watthour Meter: 

Illustrations 286, 287 

Dimensions 288, 289 

Connections, External 234, 235 

Connections, Internal 241 

Constant and Register Data 291, 292 

CS Watthour Meter 24 

Illustrations 299 

Dimensions 300-307 

Connections, External 308, 309 

Connections, Internal 310-313 

Constant and Register Data 314, 315 

CB Portable Test Meter 25 

Illustrations 326, 327 

Connections, External 334, 337 

Connections, Internal 343-348 

Constants 352 

CB-2 Portable Test Meter . .25 

Illustrations 328, 329 

Connections, External 334-337 

Connections, Internal . 343-348 

Constants 352 

CB-3 Portable Test Meter 25 

Illustrations 330, 331 

375 



Page 

CB-3 Portable Test Meter: 

Connections, External 334-337 

Connections, Internal 343-347 

Constants 352 

CB-4 Portable Test Meter - 25 

Illustrations 332, 333 

Connections, External 338-342 

Connections, Internal 343, 344, 348-351 

Constants 352 

CP Prepayment Meter 26 

Connections, External 271, 272 

Connections, Internal 273 

Constants 291, 293 

CP-2 Prepayment Meter 26 

Illustrations 274, 275 

Dimensions 276 

Connections, External 277 

Connections, Internal 278 

Constants 291, 292 

CP-3 Prepayment Meter 26 

Illustrations 279, 280 

Dimensions 283 

Connections, External 284 

Connections, Internal 285 

Constants 291, 292 

CP-4 Prepayment Meter 26 

Illustrations 281, 282 

Dimensions 283 

Connections, External 284 

Connections, Internal 285 

Constants 291, 292 

Constants, Meter 103-111, 127-135, 166-173, 195-203, 

216, 291-293, 298, 314, 315, 324, 325, 326, 352 

Direct Current Meters 22-25 

D-3 Watthour Meter 20 

Illustrations 136, 137 

376 



Page 

D-3 Watthour Meter: 

Dimensions 138, 130 

Connections, External 140-148 

Connections, Internal 149-153 

Constant and Register Data 166-173 

D-4 Watthour Meter 21 

Illustrations 154, 155 

Dimensions 156 

Connections, External 157-165 

Connections, Internal 149-153 

Constant and Register Data 166-173 

DS-2 Watthour Meter 21 

Illustrations 174, 175 

Dimensions 180 

Connections, External 184-190 

Connections, Internal 193, 194 

Constant and Register Data 195-203 

DS-3 Watthour Meter 21 

Illustrations 176 

Dimensions 181 

Connections, External 184-190 

Connections, Internal 193, 194 

Constant and Register Data 195-203 

DS-4 Watthour Meter 21 

Illustrations 176, 177 

Dimensions 182 

Connections, External 184-192 

Connections, Internal 193, 194 

Constant and Register Data 195-203 

DS-5 Watthour Meter 22 

Illustrations 179 

Dimensions 183 

Connections, External 184-192 

Connections, Internal 193, 194 

Constant and Register Data 195-203 

377 



Page 

Finish, Meters 3 

G-2 Watthour Meter 25 

Dimensions 318, 319 

Connections, External 321-323 

Connections, Internal 313 

Constants 324, 325 

G-3 Watthour Meter 25 

Illustrations 316 

Dimensions 317, 320 

Connections, External 321-323 

Connections, Internal 313 

Constants 324, 325 

Inspection 16 

Bearings 16 

Moving Element 17 

Register Mechanism 17 

Damping Mechanism 17 

Electrical Element 18 

Installing 12 

I Watthour Meter 18 

Illustrations 50, 51 

Dimensions 52-54 

Connections, External 55-59 

Connections, Internal . . . . 60-72 

Connections, Double Lag 73 

Connections, Separate Potential 74 

Constant and Register Data 103-111 

1-8 Watthour Meter 19 

Illustrations 75, 76 

Dimensions ■ 77, 78 

Connections, External 79, 80 

Connections, Internal. ... 81, 82 

Connections, Double Lag 83 

Connections, Separate Potential 84 

Constant and Register Data 103-110 

1-10 Watthour Meter 19 

378 



Page 

I- 10 Watthour Meter: 

Illustrations 98, 99 

Dimensions 100 

Connections, External 101 

Connections, Internal 102 

Constant and Register Data Ill 

IS Watthour Meter 19 

Illustrations 112 

Dimensions 116 

Connections, External 122-125 

Connections, Internal 119, 120 

Constant and Register Data 127-135 

IS-2 Watthour Meter 20 

Illustrations 113, 114 

Dimensions 117 

Connections, External 122, 123, 125, 126 

Connections, Internal 121 

Constant and Register Data 127-135 

IS-3 Watthour Meter 20 

Illustrations 115 

Dimensions 118 

Connections, External 122, 123, 125, 126 

Connections, Internal 121 

Constant and Register Data 127-135 

IB Test Meter 22 

Illustrations 204, 205 

Connections, Internal .214, 215 

Constants 216 

IB-2 Test Meter 22 

Illustrations 206, 207 

Connections, External 212, 213 

Connections, Internal 214, 215 

Constants 216 

IB-3 Test Meter 22 

Illustrations 208, 209 

Connections, External 212, 213 

379 



Page 
IB-3 Test Meter: 

Connections, Internal... 214, 215 

Constants 216 

IB-4 Test Meter 22 

Illustrations - 210, 211 

Connections, External 212, 213 

Connections, Internal 214, 215 

Constants 216 

IP-2 Watthour Meter 26 

Illustrations 85, £ 

Dimensions 87 

Connections, External £ 

Connections, Internal 89, 90 

Constant and Register Data 103, 106, 109 

IP-3 and IP-4 Meters .26 

Illustrations - . .91-93 

Dimensions 94 

Connections, External 95 

Connections, Internal 96, 97 

Constant and Register Data 103, 106, 109 

Jewels 5 

Maximum Watt Demand Indicators 27 

Orders, Placing Meter 3 

Orders for Parts 4 

Portable Test Meters: 

Direct Current 25 

Induction 22 

Pivots . 5 

Prepayment Meters 25 

Registers 7 

Reading Meters, Instruction for 8 

Record Sheets, Meter Reading .9 

Stamping, Name Plate 4 

Testing 12 

With Indicating Instruments 12 

With Portable Rotating Standards 14 

380 



Page 

Testing: 

Single-Phase Meters 28 

In Series 29 

Connections of Type I 30 

Connections of Type 1-10 31 

Four- Wire, Three-Phase, Meters with Three Current and 

Two Potential Elements 41 

Three-Wire Two- and Three-Phase, and Four- Wire 

Three-Phase 42 

Connections of a Four- Wire Three-Phase Meter Having 
Three Current and Two Potential Elements for Testing 

Upon a Single-Phase Circuit 43 

Connections of a Three- Wire Two- or Three-Phase, and 
Four- Wire Two-Phase Meter Upon a Single-Phase 

Circuit 44 

Connections of a Three- Wire Two- or Three-Phase Meter 
When Checking by Means of Single-Phase Portable 

Test Meters 45, 46 

Connections of a Three- Wire Two- or Three-Phase Meter 
When Checking by Means of Indicating Instruments . . 47 

Direct Current Watthour Meters 48 

Data for Testing with Test Meters: 

Type I, 60 Cycle 33, 36 

Type I, 40 and 50 Cycle 34, 37 

Type I, 25 Cycle 35, 38 

Type 1-10, 60, 125, 133 Cycle 39 

Type 1-10, 40, 50 Cycle 40 

Type W Watt Demand Indicator 27 

Illustrations 353 

Dimensions 354-356 

Connections, External 357-367 

Connections, Internal 368-369 



381 



GENERAL ELECTRIC COMPANY 

PRINCIPAL OFFICES, SCHENECTADY, N. Y. 

SALES OFFICES 
(Address nearest office) 

BOSTON, MASS 84 State Street 

Springfield, Mass. .... Massachusetts Mutual Building 

Providence, R. I. Union Trust Building 

NEW YORK, N. Y 30 Church Street 

Rochester, N. Y. Granite Building 

Syracuse, N. Y Post-Standard Building 

Buffalo, N. Y Electric Building 

Erie, Pa Marine National Bank Building 

New Haven, Conn Malley Building 

PHILADELPHIA, PA Witherspoon Building 

Baltimore, Md Electrical Building 

Charlotte, N. C Trust Building 

Youngstown, Ohio Wick Building 

Charleston, W. Va. . . . Charleston National Bank Building 

Pittsburg, Pa. Oliver Building 

Richmond, Va Mutual Building 

ATLANTA, GA. .... Third National Bank Building 

Birmingham, Ala. Brown-Marx Building 

Jacksonville, Fla. Florida Life Building 

New Orleans, La. .... Maison- Blanche Building 

CINCINNATI, OHIO .... Provident Bank Building 

Columbus, Ohio . . . Columbus Savings & Trust Building 

Cleveland, Ohio Citizens Building 

Dayton, Ohio Schwind Building 

Toledo, Ohio Spitzer Building 

Chattanooga, Tenn James Building 

Knoxville, Tenn Bank & Trust Building 

Memphis, Tenn. Randolph Building 

Nashville, Tenn. ...... Stahlman Building 

Indianapolis, Ind. .... Traction Terminal Building 

Louisville, Ky Paul Jones Building 

CHICAGO, ILL Monadnock Building 

Davenport, Iowa Security Building 

Keokuk, Iowa ........ Monarch Building 

Detroit, Mich. . . Majestic Building (Office of Soliciting Agent) 

Joplin, Mo Miners' Bank Building 

St. Louis, Mo Wainwright Building 

Kansas City, Mo. Dwight Building 

Butte, Montana Electric Building 

Minneapolis, Minn 410 Third Ave., North 

Milwaukee, Wis. ..... Public Service Building 

DENVER, COLO First National Bank Building 

Boise, Idaho Idaho Building 

Salt Lake City, Utah Newhouse Building 

SAN FRANCISCO, CAL. Rialto Building 

Los Angeles, Cal 124 West Fourth Street 

Portland, Ore. Electric Building 

Seattle, Wash. Colman Building 

Spokane, Wash. Paulsen Building 



For Texas and Oklahoma Business refer to 
General Electric Company of Texas, 

Dallas, Tex 1911 No. Lamar Street 

El Paso, Tex. . . . Chamber of Commerce Building 

Houston, Tex. Chronicle Building 

Oklahoma City, Okla Insurance Building 



FOREIGN SALES OFFICES 
Schenectady, N. Y., Foreign Dept. 
New York, N. Y., 30 Church St. 
London, E. C, England, 83 Cannon St. 
For all Canadian Business refer to 

Canadian General Electric Co., Ltd., Toronto, Ont. 



DEC VI 1912 



